This is especially useful in areas with polluted water sources. It also removes many heavy metals and chemical contaminants. The Grayl Geopress stands out among water filters in that it removes not just protozoa and bacteria, but viruses as well, a rarity among filter systems. The UV-emitting cap is rechargeable in four hours or less with a USB compatible charger. It’s important to note that this device does not filter water, so be careful to fill it with water that is free of debris or other particulates. It is also self-cleaning in that it turns on every four hours for 20 seconds to keep the bottle free of mold, bacteria, viruses, and other harmful pathogens. The WAATR Craz圜ap uses a LED UV light emitter built into the canteen’s cap to sterilize tap water in one minute, and water from springs and other wild sources in two and a half minutes. The good news is that there’s a technological solution available: UV light. Adenovirus, astrovirus, hepatitis A and E, rotavirus, norovirus and their ilk can turn a vacation into a disaster. The World Health Organization estimates that nearly 25 percent of the world’s population is consuming fecally-contaminated water. This may be especially important when traveling outside of the United States to places with sketchy water supply systems. It’s important to note that most portable water filtration systems don’t remove viruses. We’ve filtered some pretty turbid water with the GravityWorks over the years, and it has performed every time. Most importantly, the hollow fiber technology filters out any particles larger than 0.2 microns which removes 99.9999 percent of bacteria and 99.9 percent of protozoa. The filter is replaceable (manufacturer recommends after 1,500 liters of use). It’s also compact and, when rolled up, takes up about the same space as a Nalgene 1L bottle. The system is versatile enough so that the clean bag can be used in a backpack as a hydration bladder or hung from a tree for camp use. Once set with the dirty bag placed above the clean bag, gravity does the work, with no laborious pumping required. The Platypus GravityWorks is a lightweight system at 11.57 ounces (328 grams) and filters quickly, working through up to 1.75 liters per minute depending on how much sediment is in the water. For smaller groups, we recommend the 4L version, although Platypus also offers a 6L version for larger groups. While this high-volume filter is a top performer, it’s overkill for solo use and ideal for groups of two or more. We loved the Platypus GravityWorks when we reviewed it in detail earlier this year.
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