LifeStraw are well-known for their simple blue water filtration straw that has been around for many years. I have one of those as well, and it makes an excellent item to keep in an emergency preparedness kit. Recently LifeStraw started to sell several other products that use the same filtration technology, but offer a variety of different methods to actually do the filtration. The issue with their standard straw is that you either have to drink right from a stream by lying down on the ground, or you have to have a wide-mouth plastic bottle with you such as a Nelgene.

Perhaps my favourite way to use the LifeStraw Flex is to screw it onto the top of a Platypus SoftBottle though. The included rubber bottle that comes with the flex is only 650ml, but the SoftBottles give you many more options. With the straw screwed onto the top of the bottle, you can also give the bottle a squeeze as you suck though it which increases the flow rate to something much more satisfying. The size of the screw thread is pretty universal, so you could also use most standard plastic water bottles such as the popular-with-ultralight-hikers Smart Water bottles.


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Another option is to pair the straw with a hydration bladder such as a CamelBak. You can either fit it to the end of the bladder hose as you see in the photo, or you can splice your hose in two and insert the filter into the middle of the line.

They have several disadvantages. They are effective on a significantly smaller range of contaminants than most under-sink or faucet-mounted filters because they rely on gravity instead of water pressure and thus have to employ a less-dense filter.

In the United States, public water supplies are regulated by the Environmental Protection Agency (EPA) under the Safe Drinking Water Act, and water leaving a public water-treatment plant must meet strict quality standards. However, not all potential contaminants are regulated.

The two main certifying labs for water filters are the NSF itself and the Water Quality Association (WQA). Both are fully accredited in North America by ANSI and the Standards Council of Canada to do ANSI/NSF certification testing.

The Brita Elite Filter (formerly the Longlast+) is ANSI/NSF-certified for more than 30 contaminants (PDF), including lead, mercury, microplastics, asbestos, and two common PFAS: perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS). That makes it the most comprehensively certified pitcher-type filter we have tested, and the one we recommend to people who want the most peace of mind.

The LifeStraw filter is ANSI/NSF-certified for chlorine, lead, and mercury. The company has also had its filters tested to multiple other ANSI/NSF standards by IAPMO US and IAPMO India, which are accredited by ANSI and the Water Quality Association, respectively. These include Standard 401 for emerging contaminants; cadmium, chromium (III), and copper; glyphosate; asbestos; and bacteria and parasites (something our other picks lack). LifeStraw has also had its filters tested to other standards created by the World Health Organization (WHO) and the EPA. And LifeStraw is open about its testing program and makes its test results public (PDF), which solidifies our trust in its claims.

To see how well the LifeStraw dealt with sediment, Tim used hydrogen peroxide to rapidly convert a piece of #0000 steel wool to fine particles of rust, then mixed half-teaspoons of the rust into 2 cups of tap water at a time and filtered this enticing brew through the LifeStraw. After 40 cups, the rust solution was all used up but the filter was still working, albeit slightly more slowly than at the start of the test. And, yes, Tim drank a glass of the filtered stuff. It tasted like spring water.

Tim Heffernan is a senior staff writer focusing on air and water quality and home energy efficiency. A former writer for The Atlantic, Popular Mechanics, and other national magazines, he joined Wirecutter in 2015. He owns three bikes and zero derailleurs.

A carbon filter can reduce the levels of many common contaminants, such as lead and disinfection byproducts. There are many options for carbon filters, from countertop pitcher filters to faucet-mounted filters, undersink filters and whole-house filters.

We found that it removes chlorine to improve the taste as well as other chemicals such as heavy metals, carcinogens, pharmaceuticals, endocrine disruptors and more according to our review of third-party lab test data. Not only did it impress as our best overall pick, but it also doubles as our best value pick thanks to both its low upfront and low yearly filter replacement costs.

It also makes it easy to gauge when to change your filter: Just stick the meter in the filtered water and read it. Zero advises changing the filter when the TDS meter reads 006, though this is a personal preference since TDS affects the water's taste. Some may prefer more TDS in their water while others prefer less. It comes in a 10-cup or 12-cup option. One downside, however, is that it offers a higher yearly cost to replace the filters.

The AquaTru water filter dispenser removes over 80 contaminants, one of the highest among the water filters we tested, which earned it one of the top spots in our tests. We verified that it removes contaminants such as chlorine, heavy metals like lead, VOCs, pharmaceuticals, endocrine disruptors and more. In addition, it removes over 90% of fluoride, which some may prefer removed while others may not.


The AquaTru comes with three different filters: pre/carbon, reverse osmosis and VOC filter. The pre/carbon filter removes particles, like sediment and rust, as well as chlorine, which improves taste. The reverse osmosis takes out impurities down to 1/10,000 of a micron, reducing arsenic, lead, parasitic cysts, copper and more. All of these contaminant removal claims were verified with our review of independent lab test data.

Our pros appreciated that the AquaTru App tells you when the filter needs changing as well as other stats like how many gallons of water you've filtered or the amount of total dissolved solids in the tap and filtered water. The tap water reservoir holds 16 cups of water, so you won't have to refill as often, and the carrying handle makes it easy to go to and from the sink.

The downside: This dispenser has a pricey upfront cost of nearly $485, but the filters last longer than most, making the yearly cost of replacing filters comparable to some pitchers that filter fewer contaminants.


Most water filter pitchers remove chlorine to improve the taste of the water, which could also lead to a rise in bacteria in the filtered water. Larq solves this by using UV light to inhibit E. coli and Salmonella from building up in the water due to chlorine removal. It filters over 45 contaminants such as microplastics, heavy metals, VOCs, endocrine disruptors PFOA and PFOS, pharmaceuticals and more, which we verified through a review of third-party test data. It has a rechargeable removable wand that powers the UV light, which is visible as the water filters through.

During our Lab testing, the Larq app was easy to install, and it helps keeps track of when you need to change the filter. One thing to note, we found the app at times disconnected or uninstalled itself, so the tracking may not be entirely accurate.

What sets Aarke apart from the rest is the unique stainless steel water filter. Instead of throwing away a plastic cartridge like most water filter pitchers, the Aarke filter pitcher allows you to simply change the granules inside the stainless steel filter. It helps remove chlorine, copper, lead and limescale.

Many water filter pitchers are not dishwasher-safe, so you need to wash them by hand, which is one of the reasons our experts liked this Pur water filter pitcher. All the parts can go in the dishwasher, so no hand washing is required. When we tested this at home, we found it was easy to fill and pour from, thanks to a flip top that stays in place when pouring water. The standard filter helps remove chlorine and some heavy metals, which we verified through third-party lab test data review.

In our tests, we liked that it was light and easy to hold and pour, weighing in at a mere 6 lbs when filled. The trade-off is that you need to refill it more often since it does not hold a large volume of water (it only holds 2.5 cups of tap water). LifeStraw states that it takes a few refills of the pitcher to get the water flowing, but we noted that even after a few refills it was still filtering slowly. Take note: We found the filters easy to accidentally wash, which leads to soap in the filter, so be sure to read the instructions and remove them from the plastic housing before washing.


We also saw in our Lab tests that it filters slowly. However, our home testers did not have this problem. The Berkey comes in multiple sizes with the smallest one starting at $345, but according to Berkey, the filters can be cleaned up to 100 times with a 3M Scotch-Brite pad. Over time, this may save money compared to pitchers that need to have their filters changed every few months.

The Hydros Glass Slim Pitcher will improve the taste and clarity of your water by removing chlorine and sediment. It's great for someone who wants a basic pitcher, plus it will save some space in your fridge with its small 4-in. diameter footprint. Our experts found it's lightweight when filled, weighing a little under 4 lbs. We loved that the filter didn't require any pre-soaking and was ready to use with only a 15-second flush under running water.

Our pros were pleasantly surprised it filtered water nearly instantaneously. The downside: The opening is small, so water tends to spill over the lid while filling. The water pours out smoothly, though it feels bottom-heavy when you grab it by the pitcher's neck to pour. It's also available in a plastic version.

ZeroWater water filter pitchers and dispensers are designed to provide great tasting water for everyone in your home. Our 5-stage filters are the only pour through filter certified by IAPMO to reduce PFOA/PFOS, lead and chromium. These pitchers are the key to delivering clean and pure tasting water right to your table. 2351a5e196

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