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Home tools Buyer's Guides from tech enthusiast who loves technology and clever solutions for better living.
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Top Of The Best Reusable Filters Reviewed In 2018Last Updated October 1, 2018
№1 – 4 Reusable Single K-Cup Solo Filter Pod Coffee Stainless Mesh for Keurig Brewers By iPartsPlusMore
№2 – Keurig 2.0 My K-Cup Reusable Coffee Filter
№3 – 6-Pack Reusable Gold Plated Mesh Coffee Filters For Keurig 2.0 and 1.0 Brewers Fits K200/K250, K300/K350, K400/K450/K460, K500/K550/K560
Shop filter coffee machines
Filter coffee machines are perfect for making large quantities of freshly brewed coffee. The water slowly drips through a container holding the ground coffee, using either a paper or permanent reusable filter. As the water flows through, it absorbs the flavours and aromas. The filter coffee is then ready to serve from the pot or carafe and is usually kept warm on a hot plate making it a quick and easy option for re-fills.
Coffee machines with a permanent filter require more cleaning but can save money in the long term. Removable paper filters are usually the easier option as they can be thrown away. Filter coffee machines come in different cup volumes depending on the number of cups you want to make in one sitting.
Shop pod & capsule coffee machines
These coffee machines use disposable pods or capsules filled with coffee sealed inside. The coffee is blended, roasted, ground and then sealed within the pod. Once you put the coffee capsule into the machine, water is heated and forced through the coffee, releasing the full flavour into the cup. It’s fast and convenient without messy filter holders to clean.
There’s a wide variety of pods and capsule systems available from different brands, each incompatible with the other. Tassimo and Nescafe Dolce Gusto machines use plastic pods to create barista-style coffee drinks. Nespresso use infinitely recyclable aluminium capsules, filled with their signature Grand Cru coffee. Nespresso coffee machines also have a high 1bar pressure to create premium espresso and some Nespresso machines use fresh milk for the perfect cappuccino and latte coffee drinks.
Shop espresso coffee machines
An espresso coffee maker is a popular way to make barista-style espresso at home using a filter holder and pre-ground coffee. Pump machines have a separate water tank and a fast Thermoblock heating system which heats the water to the optimum temperature for the perfect espresso crema.
The water is then pushed through the coffee filter holder at the correct bar pressure to produce a rich, smooth espresso. Some pump espresso machines have a steam arm that is used to steam and froth milk for cappuccino and latte drinks. Many machines can also be used with coffee pods for added convenience.
Size and weight
If you’re looking to store your coffee machine away when you’re not using it, make sure it’s small enough to fit into a kitchen cupboard and light enough to manoeuvre. Larger coffee machines are ideal if you’re keeping them on display on a worktop.
Knowing how to take care of your coffee machine is important if you’re using it frequently. Cleaning the machine and regular maintenance checks will prolong its lifespan and ensure your coffee tastes as good as can.
Before you clean your machine, always make sure it has cooled down and is unplugged.
Turn off your coffee machine when you’re not using it to make sure it’s always in great working condition.
Don’t leave water in the tank for long periods of time and always use fresh water for boiling.
Do you find it difficult to decipher the language of coffee?
Read on to discover more about our most popular coffee drinks.
An espresso is a strong, pure coffee made by forcing high pressure hot water through ground coffee beans. A perfectly made espresso should have soft foam on top called crema. Espresso forms the base for other coffee drinks including cappuccino and latte.
A latte is a single shot of espresso (30ml) with steamed milk and a little frothed milk on top.
A cappuccino consists of equal parts espresso, steamed milk and frothed milk. 1/espresso, 1/steamed milk, 1/milk froth. Sprinkle a little cocoa powder on top for an authentic touch.
A single or double shot of espresso with a touch of steamed milk froth on top.
Once you have a soft dough, flour your hands well and lightly knead the dough, mixing in the lemon zest and pistachios. Turn the dough out onto a well-floured surface, and roll it into a thick log shape. Press down lightly on top of the log to flatten it slightly. Place the biscotti log onto the greased baking tray, and bake for 2minutes or until golden.
Your biscotti will now be very crunchy, ideal for dipping in a strong espresso to soak up all of the wonderful coffee flavour.
Italian biscuit recipes – 2) Chocolate, ginger and almond biscotti
A delicious twist on the classic biscotti recipe, try this chocolate and almond option when you’re entertaining.
Get creative with latte art
From hearts and leaves to even animals, latte art is a great way to achieve a barista-style coffee at home and to impress your family and friends. Try our step-by-step guide to creating the Rosetta leaf below. But remember, it takes practice!
Continue the rocking motion and start to move the pitcher towards the back of the cup.
Why you need one
The need for a privacy filter will vary depending on the employee’s work habits. Of course, those most at risk of visual hacking use a computer in a public place, or in close proximity to clients or customers. Due to the nature of their work, frequent travelers, as well as employees in customer service or sales positions, could be particularly susceptible to visual hacking.
It takes just a few seconds for someone to glean confidential information from a computer screen, which could potentially be used for malicious or illegal intent. The risk is especially high given the ubiquity of smartphones with high-quality cameras, making it extremely easy to snap a quick photo without anyone noticing.
In fact, 3M used white hat hackers in a study to investigate the phenomenon. Hackers tried to glean confidential information using visual hacking from more than 100 companies in 1industries. They were successful in nearly 90 percent of trials, and it usually took 1minutes or less. Hackers were able to recover nearly five pieces of sensitive information in each trial, including financials and confidential employee and customer information – using nothing but their eyes.
Ultimately, assessing your company’s true risk of visual hacking is going to be difficult. For some businesses, simply educating your employees about the issue can be enough. After all, many employees are not actually aware of what types of information are sensitive and should be protected. For other companies, privacy filters for laptop screens – which are relatively cheap and easy to install – are a no-brainer.
What to look for
Image clarity: Privacy filters tend to block some light from laptop screens, making them appear dimmer. Different models differ in this regard, with the best-rated filters being made by 3M. The company now makes a High Clarity Privacy Filter model, which claims it can offer up to 30 percent better experience than a regular black filter. Dimming can be offset by turning up a screen’s brightness, but that in turn can diminish your battery life.
Application: The way that you’ll apply the filter to your laptop screen varies from model to model. Filters made by 3M are easy to apply and remove over and over because they adhere using reusable micro-suction strips that don’t leave any sticky residue.
Size: Privacy filters come in all the standard laptop sizes.
Matte finish: Some privacy filters can give glossy laptop screens a matte look, which helps ward off distracting reflections but can make colors look dull. Some filters are reversible, letting you choose a matte or glossy side before applying.
Color: Privacy filters come in a couple of different colors. The basic filters will look black when viewed from an angle. You can also buy filters that give off a gold sheen when viewed from the side. Gold filters are more expensive because they won’t dim your screen as much, but they also tend to be more reflective than black filters, so they’re bad for people who work outdoors. The vibrant gold sheen can also be distracting to workers sitting nearby, even if they aren’t trying to spy on you.
Air purifier sales soar as NCR chokes on pollution
Most offices are still open, leaving no option for employees to evade the alarming air pollution. In such a scenario, it will be wise for a person to use special air-pollution masks if at all they need to venture out of their houses.
These masks are not only an effective agent against air-pollution also provide protection against a few air-borne diseases. These masks are slightly expesnsive than surgical masks but offer much better functionality. The masks are required to be replaced after a few days of usage.
The masks are available in N9and N9variants which are degrees of filtration. These respirators are designed to offer maximum protection without hampering the breathing pace. The disposable respirators offer around 9per cent protection against air-pollution.
These respirators are made for long term usage and are much more expensive than the disposable ones. The respirators come with a sheet of activated carbon and a replaceable filter that are to be replaced in every 3-days of general use.
K&N’s Universal Air Filters are designed and manufactured for a wide variety of applications. Regardless of the angle, offset diameter of the air intake, there is a K&N Universal air filter for your equipment. All filters are constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16″ (1.5mm) to fit in-between sizes. K&N Universal air filters are available in round, tapered (cone style) and oval designs, for just about any special application. Select a universal filter type below to view the sizes that are available.
TO EXPLORE YOUR FILTER, visit: Universal Filters TO SEARCH BY DIMENSION: Universal Filters by Dimension
K&N air intake products add horsepower, torque and acceleration to your vehicle. If you are looking to improve performance, K&N air intakes and cold air induction systems are easy to install and come with a million mile limited warranty. K&N air intake systems are available for cars, trucks, motorcycles, ATV’s and RV’s.
The uses are
TO EXPLORE YOUR FILTER, visit: Motorcycle & PowerSport Filters Oil Filters:
K&N automotive oil filters provide high flow rates while providing outstanding filtration. High filter flow rates are especially important in racing vehicles where heavier grade oil is used and the oil is pumped much faster than in a standard vehicle. K&N automotive oil filters are engineered to handle all grades of synthetic, conventional and blended motor oils
Air Filter Facts
We believe the primary function of an air filter is to deliver both high airflow and superior dirt protection. We design our air filters to provide minimum restriction allowing high airflow into an engine. In the vast majority of cases increased airflow will increase engine performance measured by horsepower and throttle response (torque). The performance benefits of maximum airflow are clear, compelling and well documented. That is why so many professional racers are willing to run expensive vehicles with no air filter, as opposed to installing a disposable air filter. They are seeking the additional horsepower and throttle response needed to win the race.
We design our air filters to provide superior filtration of the contaminants that can harm your engine while maximizing the airflow characteristics of the filter in question. The ability of an air filter to protect your engine is generally measured in accordance with testing procedure ISO 501We subject a sample of our filter designs to this test procedure using Coarse Test Dust, which includes particles ranging in size from less than 5.microns to 17microns. As a point of reference, a human hair is approximately 50 microns in diameter. The result of the above test procedure is a specific air filtration efficiency number. This efficiency number represents the percentage of test dust retained by the filter and thereby kept out of an engine. Our goal is to design our air filters to achieve maximum airflow while targeting overall filtration efficiency at 98%.
Because no two air filters are alike, the specific airflow and overall filtration efficiency will vary depending on the filter in question. However, you can rest assured that each air filter we sell, has been designed to achieve high air flow while providing superior filtration.
Both air flow and dirt protection are critical to engine performance. For this reason a consumer should always evaluate an air filter based on both its filtration efficiency and air flow capabilities. It is very easy to design an air filter that exhibits high airflow simply by reducing its filtration to unacceptable levels. As the “look” of a K&N air filter has become popular, many companies have begun offering products that copy that “look.” While imitation is said to be the sincerest form of flattery, our own testing has shown that many of these look-alike products do not provide a safe level of engine protection.
Filtration 10- A Deeper Cut
Most people believe that all air filters function on a go/no go basis where dirt particles that are larger than the openings in the filter media are trapped while particles that are smaller than the openings can pass right through. A dry paper air filter does function in this manner. That’s why paper filters are so restrictive to air flow. The openings in this type of filter have to be very small to filter efficiently.
The oiled cotton filter media used in the K&N air filter functions in an entirely different manner. There are scientific principles that determine how an air filter removes dirt particles from the air stream. The first of these principles is known as interception, which applies to dirt particles traveling with the air stream. Air flow will always take the shortest path and as the air is forced to flow around the filter’s fibers some of the particles will contact the sides of the fibers and be captured. These particles are then held in place by the oil or tacking agent in the fiber.
Another principle is known as impaction, which mostly affects larger or heavier dirt particles. Impaction occurs when the inertia or momentum of the particle causes it to deviate from the flow path. In other words the heavy particles do not follow the air stream around the filter’s fibers but instead they run straight into the fibers and are captured.
Paper vs K&N
To meet minimum filtration standards, paper air filters must be thick and/or the fibers must be tightly compressed and dense. Therefore paper elements that provide adequate filtration are more restrictive to air flow by design. Additionally, as a paper filter becomes more and more clogged, the pressure inside the filter drops while the atmospheric air pressure (approximately 14.psia at sea level) outside the filter remains the same. It’s like using your lungs to draw the air out of a plastic milk bottle. When the pressure differential becomes too great, the bottle will collapse. The same thing could happen to your paper filter, although it is unlikely. But what will happen could be just as severe. An excessively high pressure differential created by a restricted filter can literally pull dirt particles through the paper medium. In other words, the performance of a paper filter, i.e. air flow through the filter and its ability to protect your engine, DECREASES near the end of its service interval.
Washable and Reusable
All of our air filters are washable and reusable. They can be easily cleaned and oiled using our K&N Recharger kits as many times as reasonably necessary. In our testing laboratory, we have washed and re-oiled one K&N Air Filter more than 100 times and it still performed up to specification. We recommend you check your air filter every 30,000 miles, however, under most street conditions the filter will not require cleaning until 50,000 miles of continuous use. And yes, we’ve heard the stories of customers who ran their K&N filter for 100,000 miles without a cleaning, but we believe cleaning after 50,000 miles to be the most beneficial service life without sacrificing air flow.
Off-Road and Racing Off-Road
An air filter element becomes an insurance policy when used in off-road applications. Competitors will sacrifice a high-tech engine for a chance to win a race — but to win, they must finish. If the engine ingests too much dirt and debris, it may die an ugly death before the vehicle can cross the finish line.
You might think this would be the perfect application for an inexpensive, throw-away paper filter. But remember, in competition a little extra horsepower can mean the difference between coming in first or finishing second. The air filter now becomes an important part of the performance package.
K&N air filters are designed to provide minimum restriction long after disposable air filters have begun choking an engine. In other words, due to its characteristics, the restriction of a K&N replacement filter increases at a slower rate when compared to a disposable filter, i.e. a K&N filter will last longer under the same conditions. That’s why most off-road competitors choose K&N filters.
In a hypothetical 24-hour off-road race to further the point, a properly sized K&N filter will see the racer through to the end with cfm to spare. The equivalent disposable air filter, on the other hand, will need to be replaced with a fresh element to ensure the engine has an adequate supply of air to complete the course. A K&N will provide excellent filtration without sacrificing air flow for a longer period of time — that’s performance with value.
One might consider a paved road course or oval track as a clean air zone. After all, how much dirt and debris could be hovering above an asphalt track?
Subscribing to that theory, a road racer may elect to forgo an air filter in favor of large volumes of unrestricted air. However, testing the theory using an air filter enclosed in a vented housing should dispel the myth. The filter and housing will trap particles of loose trash kicked up by other race cars during the heat of battle. Dirt, small stones and pieces of shredded rubber expelled from soft compound racing tires can be found inside the housing after even a short race. Once a driver, car owner or engine builder realizes just how much trash is thrown around during a normal race, few would expose their expensive engines to unfiltered air in future events.
Whenever possible, performance enthusiasts should install a K&N 360 degree open-element filter. A correctly sized conical or round filter will deliver virtually unrestricted air flow. And, as we have learned, providing the engine with all of the air it needs promotes optimum performance. In a high speed application, a K&N filter will straighten the air which counteracts turbulence.
Straight cut velocity stacks, for example, pose a unique problem. Exposed to the outside air, velocity stacks experience a phenomena that actually hinders performance at high speed. We are referring to stacks and air horns that protrude through the hood and extend into the air stream so the direction of the air rushing over the car is at a perpendicular angle to the length of the tube.
Air moving rapidly over these stacks create turbulence inside the opening. At high speed, the rushing air tends to create a partial vacuum inside the tube. The condition is counterproductive to air flow. The phenomena also effects open carburetors. The higher the ground speed, the greater the problem. Vacuum created by the engine is trying to coax air into the cylinders and the high speed air flowing over the open end of the stack is causing resistance.
Reversion creates other problems. In an automotive application, reversion refers to reversed air flow, or in simpler terms, it’s when air in the intake runner reverses direction for a split second. The condition is caused when a burst of pressure escapes into the intake runner from the cylinder during valve overlap.
Reversion creates resonance shock waves inside the tubes which exit the open end of the tube at various rates depending on engine speed. It has also been proven that these shock waves interfere with each other when the stacks are in close proximity.
Installing a free-flowing air filter on top of each stack or over the carburetor air horn eliminates these conditions. How? The solution is simply explained. The filter creates a plenum over the opening. Air entering the filter is slowed, smoothed and straightened. The filter then becomes an endless source of calm, clean air. Shock waves dissipate within the confines of the plenum without interfering with the shock waves emitted from an adjacent stack.
A Better Choice For The Environment
K&N cotton air filters have always been washable and reusable, designed for the life of an engine. If you assume an engine life of 150,000 miles in which a disposable air filter must be replaced every 15,000 miles, only one K&N air filter would be used during the same period in which disposable air filters were discarded. Considering there are millions of vehicles throughout the world, the volume of disposable air filters that could be eliminated from our landfills is a staggering number.
If maximum horsepower is the objective, the size and shape of the air filter element is paramount.
Let’s first consider shape. When fitting a conventional round filter on top of the engine, such as a carburetor, central fuel injection or throttle body fuel injection, we have found a large diameter, short filter will flow more air than a small diameter, tall filter. For example, a 10-inch diameter filter 2-inches tall will flow more air than a 5-inch diameter filter that is 4-inches tall. Where space permits, the height of the filter should be between 1/and 1/of its diameter.
The shape of the filter is less important if the application calls for a remote mounted filter, which includes many late model fuel injected models. Typically these vehicles will use a flat panel filter or a conical or cylindrical shaped filter with a rubber mounting flange designed to be mounted on the end of the inlet hose.
That brings us to size.
Use the formula below to compute the minimum size filter required for your particular application. The usable portion of the filter is called the EFFECTIVE FILTERING AREA which is determined by multiplying the diameter of the filter times Pi (3.1416) times the height of the air filter in inches, then subtracting.75-inch. We subtract.75-inch to compensate for the rubber seals on each end of the element and the filter material near them since very little air flows through this area.
A = effective filtering area CID = cubic inch displacement RPM = revolutions per minute at maximum power Example: A 350 CID Chevy engine with a horsepower peak at 5,500 rpm.
If you are sizing a panel filter, multiply the width of the filter area (not the rubber seal) times its length. If you are sizing a round filter, use the following formula to determine the height of the filter.
A = effective filtering area H = height D = outside diameter of the filter 3.1= pi 0.7= the rubber end caps Example:
Referencing the K&N catalog shows the proper filter for this application would be an E-1500 which is 3.inches tall. Keep in mind, this is the minimum size requirement. To extend the service interval and to provide an even greater volume of air to the engine, install the largest filter that will fit in the space allotted. If the space above the engine is restrictive, perhaps a remote filter arrangement could be used to gain space.
Off-road conditions require added filter area. A filter should be sized 1-1/to times larger than normal for any conditions that could be considered severe. In this case, the E-1500 used in our example should be replaced by an E-1120 or an E-1150. For long distance off-road events, two double-size remote mounted filters would be best.
A K&N Filtercharger is a high-performance air filter, both in terms of air flow and filtration. However, the service interval can vary widely depending on the severity of the driving conditions. The service interval can be from 100 miles in a desert-racing environment to 50,000 miles for normal street use. The proper way to determine when an air filter needs service is with an air restriction gauge. Such a device is commonly used on heavy duty trucks and construction equipment. A restriction gauge, measures the pressure differential inside and outside the filter and gives the information in different forms of measurement. As the filter collects more and more dirt, the restriction value increases. At a predetermined point or rate of restriction, the filter is serviced. The maximum allowable restriction for a K&N Filtercharger is 15″ of vacuum (water). If the restriction is allowed to go higher, the filter media might become so restricted that the element could distort allowing dirty air to bypass the filter and enter the engine. Conversely, cleaning a filter too often will shorten its serviceable life expectancy. Installing a restriction gauge will optimize service intervals and take the guess work out of your maintenance schedule.
K&N air filters are washable and reusable. They are easily cleaned and oiled using a K&N Recharger kit. They can be cleaned and oiled as many times as reasonably necessary. In our testing laboratory, we have washed and re-oiled a K&N Air Filter more than 100 times and it still performed up to specification.
When servicing a K&N filter, take care not to over-oil the element. Besides impeding air flow, excess oil can migrate into the intake system where it can coat electronic sensors, which some OEM’s claim may hinder the sensors’ operation and result in a repair that will not be covered under warranty. Although K&N disagrees with such claims, as explained in more detail on this web site, in order to avoid a dispute with an OEM over the denial of a warranty claim, we suggest that you be careful not to over-oil your K&N air filter. Never saturate the filter. If oil drips from the filter, wash it and start over. Use only K&N oil. For example, an E-1500 filter has 92.4-inches of surface area requiring 1.70fluid ounces of oil. Follow oiling instructions included with your filter or refer to the instructions listed here.
Emission Warranties on New Vehicles
THE MYTH: A manufacturer’s new-vehicle warranty is automatically voided once an aftermarket part (non-original equipment) is installed.
THE TRUTH: Rarely does the use of aftermarket parts violate a new-vehicle warranty.
THE RULES: Federal law, (the Clean Air Act), requires two emissions warranties: a “defect” warranty and a “performance” warranty. “Defect” warranties require the vehicle manufacturer to produce a vehicle which, at time of sale, is free of defects that prevent it from meeting required emissions levels for its useful life, as defined in the law. “Performance” warranties require that vehicle manufacturer make repairs – at no cost to the owner – should a vehicle fail to meet certain levels of emissions performance during the warranty period. This period ranges from years (or 24,000 miles) to years (or 50,000 miles) for most parts, and up to years (or 80,000 miles) for certain emission-controlled parts, specifically, the catalytic converter, the electronics emission-control unit and the on-board diagnostic device (check owner’s manual for specifics on your vehicle).
Consumers are protected under a parts self-certification program administered by the Environmental Protection Agency (EPA).
If a parts maker self-certifies it’s parts under this program, the vehicle manufacturer cannot void the emissions warranty even if the certified part fails and/or is directly responsible for the emissions warranty claim. In this situation, the vehicle manufacturer must arrange a settlement with the parts manufacturer, but the new vehicle warranty is not voided under the law.
If a parts maker chooses not to self-certify it’s parts, the only case where a vehicle manufacturer can void the emissions warranty is if a non-certified aftermarket part is proven to be responsible for an emissions claim.
Winix 5300-Air Purifier
This filter is the same size and uses the same fan and sensors as the 5500-2, and is also rated to 360 square feet. It comes in only one color, doesn’t come with a remote, and has slightly more charcoal in it’s filter—but not enough to meaningfully reduce VOCs and odors.
How we tested
For 201we conducted two new tests of air purifiers. John Holecek re-created his 201lab tests in a new round of testing, including new models. Tim Heffernan did a week-long real-world test—the first of its kind that we know of—using Wirecutter picks and competitors in a New York City apartment.
The lab results give a measure of absolute performance under controlled conditions and act as a baseline for comparison of the air purifiers’ performance. The real-world results give something equally useful: a detailed picture of how our air purifiers performed in an everyday home (wool rugs, pollen, city air, a cat)—and, as it happened, in the middle of a stretch of hazardous outdoor air quality.
Both tests concentrated on particle filtration; John also measured VOC (molecular) filtration, noise levels, and ownership cost over time.
Between the two writers, they re-tested our longstanding main pick, the Coway AP-1712HH Mighty; our runner-up, the Winix 5500-2; and our pick for VOC removal, the Austin Air HM-400. We also tested five new purifiers:
In 2014, John measured all of that year’s test purifiers for their effectiveness at removing VOCs, or molecular pollution. He added milliliters of ethanol to a Pyrex dish heated to 50 degrees Celsius (12°F), where it quickly evaporated, and used a fan to distribute the vapors through the test lab. He then measured the concentrations of ethanol vapor at the beginning (averaging about 3parts per million), and again after 1minutes of running the air purifiers at their highest moderate speed. (Test equipment was an RAE Systems miniRAE 3000 VOC meter.)
The results from the VOC testing were illuminating. While most air purifiers we tested claimed to be effective at removing VOCs, most had almost no impact, including the Coway AP-1512HH Mighty (our main pick). That’s because most use only a thin sorbent filter of activated carbon, alumina, and/or zeolites (a class of minerals with a unique physical form that means they can act as molecular filters). However, one model stood out: The Austin, which contains 1pounds of activated carbon and zeolite, left only 1percent of baseline ethanol remaining.
Both upfront and operating costs are a significant part of owning an air purifier. These units can be expected to last for several years, so we took a long view at the cost of ownership of our picks, including the purchase price, electrical consumption, and recommended filter replacement schedule, using the shortest time for filter replacement if a range was specified.
2016/1cost calculations. Purchase cost as of August 201Note: The Austin filter lasts five years, so the annual cost is calculated by dividing its price by five.
Real-world test details
For Tim’s real-world tests, he pitted seven air purifiers against the New York City summer air. As it happened, the week he ran the tests was one of the worst, in terms of air pollution, of 2018, with temperatures in the high 90s and numerous health advisories related to outdoor air quality.
He measured the purifiers’ performance against particulate air pollution with a TSI Aerotrak 9306, a professional-grade handheld particle counter capable of measuring particles down to the HEPA-standard 0.3-micron size.
His “lab” was the back room of his Queens apartment. It’s approximately 200 square feet (18.square meters; 1feet by 12.feet), with 8-foot-ceilings. The floor is hardwood but mostly covered with old wool rugs. There’s some wood furniture and a daybed with a wool blanket. The building is across the street from a well-planted city park and in the middle of a very leafy neighborhood. Elevated trains run past two blocks north and two blocks south, and two major thoroughfares—Queens and Northern boulevards—are just a few blocks farther. Big Alice, the city’s largest power plant, is a mile or so west; three highways, the BQE, the LIE, and the GCE, are a similar distance east, north, and south. He lives just outside the usual approach flightpath to LaGuardia International Airport. And he has a cat. Simply put: His apartment is a good place for testing particulate air pollution, from pollen, dust, and pet dander to soot and exhaust.
The week he ran the tests was one of the worst, in terms of air pollution, of 2018, with temperatures in the high 90s and numerous health advisories related to outdoor air quality.
He set each air purifier 1inches from one of the long walls of the back room, about a third of the way from one end of the room. He set the particle counter 6.feet (meters) away, 90 degrees to one side of the purifier, about a third of the way from the other end of the room. This was to avoid any potential “halo effect” of cleaned air settling near the purifier and creating a false reading.
The TSI Aerotrak 930detects particles as small as 0.micron, which is the standard for HEPA certification. Photo: Tim Heffernan
Tim ran two tests on each purifier: a 20-minute cycle on the sub-55-decibel setting (medium/midrange on most machines), and a 30-minute cycle on the high setting. Each test consisted of 20 or 30 45-second sensing periods, separated by 15-second periods with the particle counter idling, in order to generate a minute-by-minute picture of how the purifiers were performing.
Immediately prior to each test, he took a 45-second reading on his balcony, to set an outdoor baseline, and another in the test room with the purifier off, to set the indoor baseline. He then turned on the purifier and left the room for the duration of the test.
Each morning, before any tests, he simply measured the particulate levels in the back room for 20 minutes, to get a baseline on how the room was “behaving” that day: Even in still air, particulate levels vary as particles clump together, settle on surfaces, or kick back up if someone (like a Wirecutter writer) walks past.
He did not attempt to hermetically seal the room—after all, we wanted to see how the machines performed in real-world conditions—but did take two steps to make it more like a typical home with central HVAC. Tim sealed off the through-wall air conditioner with foil and tape, in case of leaks around the perimeter—most homes don’t have large holes in their outer walls. And he closed the vents on his apartment’s two forced-air ventilation shafts, which draw about 200 cubic feet of air per minute out of the apartment—and a corresponding amount into it from outdoors. (Central HVAC, by contrast, recirculates the inside air.)
After the back-room tests were finished, he conducted two additional tests. First, on a handful of units (our main pick and the large-room models), to see how they performed when running on high in a large space (the 600-square-foot living room-kitchen-dining area-hallway), with the AC on and people moving around as they normally would. And second, on our main pick, to see how it performed overnight on low with the air conditioner blasting and a guest using the daybed in the back room.
As in the lab tests section above, these graphs show the test models’ absolute performance when measured against the initial particle concentration, but in Tim’s real world apartment. And again, they show the percent change each purifier achieved, allowing for direct comparison of purifier performance by eliminating differences in initial pollution levels. The key takeaways here:
In 2018, we also tested the Dyson Pure Hot + Cool Link for particulate performance in the lab and in the real-world New York apartment. It offers two distinct fan functions, diffuse and focused; we tested it on both functions in the lab and in the real world. John further tested the Hot + Cool Link for VOC removal in the lab, given that Dyson received an upgrade of its VOC filter since our 201test of its predecessor. In every case the Dyson delivered disappointing performance relative to our pick. On particulates, it proved considerably less effective, reducing particulates by roughly 2or 50 percent (low and high fan settings respectively), versus 50+ to 85+ percent from other models. And as a VOC filter, it barely reduced the pollution level beyond the background conditions: to 34.parts per million (of vaporized ethanol) in 1minutes on the highest fan speed, versus the 36.ppm background level over the same timeframe—a percent reduction. Compare that to our pick for VOC removal, the Austin Air HM-400, which achieved an 8percent reduction in our 201lab test. It’s only fair to note that the Dyson is a unique machine, combining the functions of a fan, a space heater, and an air purifier—both HEPA (particulate) and VOC (molecular)—no other purifier we tested attempts this broad utility. But the Dyson Pure Hot + Cool Link objectively underperformed simpler, single-function air purifiers that also cost much less. Given its high upfront cost and relatively weak performance, we can’t recommend it.
Molekule advertises its technology as PECO—photo-electrochemical oxidation. It is a variant of photocatalytic oxidation, or PCO, which came to prominence in the 1990s, as a way of eliminating ethylene—a ripening agent naturally produced by fruit—in cold-storage fruit warehouses. In the early 2010s, a PCO home purifier, the Airocide, was introduced to great fanfare but deeply dubious results. Molekule’s PECO variant is 1to 100 times faster than what we’ve seen before, but Molekule says (in our lengthy interviews and in its own literature) that the fundamental chemistry is similar if not identical.
As the name suggests, these threaded filters are designed to protect the front element of your lens from all manner of scrapes, as well as from dust, dirt, moisture and fingerprints. Because they are essentially just clear glass, they don’t have any discernible effect on the amount of light entering the lens (and therefore they don’t affect exposure time).
The rule of thumb here should be, as ever, buy the best that you can afford. Remember, the light will have to pass through the filter before travelling through the lens and onto the camera sensor, so the higher the quality of that glass, the better. Realistically, this equates to ensuring you get the sharpest pictures possible.
Ok, so these aren’t actually filters, but it’s worth mentioning a couple of accessories which come handy when using filters. First of all, filters are no good if they are dirty, so make sure you keep them perfectly clean (free from dust, fingerprints etc) right up until the time you need to attach them to the front of your lens. Dedicated pouches and sleeves are available, complete with soft, no-scratch lining. Secondly, for those occasions when you do get a mark on them, be sure to have a soft, lens-friendly cloth to hand to gently remove the offending smudge.
Filtration is done by passing the raw water through a filtration sieve, via biological or by using chemical processes. One of the most common filtration methods is by passing the raw water through a carbon filter to make it safe to drink. It should be noted that this filtration method will not eliminate certain viruses or certain chemicals in the water. Water filtration does not ensure that the water is 100% safe to drink.
Purification is done to eliminate impurities from the raw water. While filtration deals with cleaning the water, purification makes the raw water free from chemicals, pathogens and possible bio contaminants. Boiling is an example of a purification method. In the same vein as filtration, purification may not eliminate other types of impurities in the water.
Just how fine are the sieves that are used to filter the water? It all boils down to the micron level. The general rule is that a smaller micron level is better at filtering out contaminants than filters that have bigger micron levels. There are some survival water filters that are advertised to have.or.microns, while others say they can eliminate 99.9% viruses and microorganisms.
How easy is it to draw and drink water using the filter? Each type has its own pros and cons. For example, the straw type requires you to submerge the device and suck the water straight from the source, while the pump type requires a bit of exertion to use.
Passes EPA Standards
Make sure to check out if a water filtration system passes EPA standards. The Environmental Protection Agency has set a standard that determines whether water is safe for public consumption or not. In short, if a water filter passes this, then it should be safe for you to use.
Outdoors 36Survival Straw Emergency Water Filter
Tap water, ground water, river water, rainwater and even flood water will turn into potable drinking water with the Outdoors 36Survival Straw. The filter may be attached to a 2L bottle and can process up to 1500 liters. The active carbon and high precision micron material make it one of the best portable water filters out there.
Survivor Filter has a.0micron UF membrane filter which can effectively remove gardia, protozoa, staph, bacteria and viruses from the water you drink. The carbon-activated filter eliminates heavy metals, odors, chemicals and the funny taste. The pre-filter cotton takes out the larger particles before it hits the carbon filter, ensuring a longer-lasting use.
LifeStraw Mission Water Purification System
The LifeStraw mission comes with all the bells and whistles from a premium water filter system. The high capacity reservoir can be filled up to a maximum of 1or L. The filter sports a hollow membrane and can be easily hooked up to a tree or any similar support. Expect an 18,000 L filter lifespan that churns out potable water at a rate of around to 1L drinking water per hour.
The best water filtration system is the one that specifically caters to all your needs, whether you need a simple filter system on short camping trips or a high-end water filter system for the whole family. It all boils down to preference. A straw water filter works best on solo hikes because of its unbeatable portability, while a gravity water filter system is best for group camping or for large-scale emergency situations.
First of all thanks for reading my article to the end! I hope you find my reviews listed here useful and that it allows you to make a proper comparison of what is best to fit your needs and budget. Don’t be afraid to try more than one product if your first pick doesn’t do the trick.
Most important, have fun and choose your Reusable Filters wisely! Good luck!
So, TOP3 of Reusable Filters
- №1 — 4 Reusable Single K-Cup Solo Filter Pod Coffee Stainless Mesh for Keurig Brewers By iPartsPlusMore
- №2 — Keurig 2.0 My K-Cup Reusable Coffee Filter
- №3 — 6-Pack Reusable Gold Plated Mesh Coffee Filters For Keurig 2.0 and 1.0 Brewers Fits K200/K250, K300/K350, K400/K450/K460, K500/K550/K560