![]() This filter takes about a minute to set up and goes through more than 1.5 liters per minute. The GravityWorks 4.0 also filters water lightning-fast, which makes it great for groups. Simply fill the clearly labeled “DIRTY” bladder with unfiltered water, elevate it above the “CLEAN” one, and make sure the filter arrow marking the “FLOW” of the filter is going from “CLEAN” to “DIRTY.” That’s it. The design is so straightforward that I would trust filtering my water to a precocious third grader. Once I started using this model, I couldn’t believe how much diarrhea, vomiting, and general malaise I had put myself through to avoid the simple three-minute process of filtering my water. I was notorious among my kayaking buddies for how reckless I was with my gut fauna as a young man, which really caught up with me in my mid-twenties (see: intestinal distress rap sheet above). I got my first one in May 2014 and couldn’t believe I hadn’t made the investment previously. The GravityWorks 4.0 is remarkably easy to use. The fear of not knowing whether we’d come back to a standing house (we were the lucky ones who did) was significantly mitigated by the knowledge that we’d at least have access to drinkable water as long as we could find a spot by a river. I was driving off into a lot of unknowns that morning, but I can’t overstate how comforting it felt to throw the filter into my car over the haphazardly packed suitcases. My wife and Jojo took off immediately while I stayed to pack up the important papers, the most treasured stuffed animals, and the GravityWorks system. In September, my wife, my three-year-old daughter, Jojo, and I evacuated when southern Oregon’s Almeda Fire started less than a mile from our home. I’ve used it to purify hundreds of gallons of water, and it’s ideal for group pursuits in the backcountry or in emergency scenarios. But if you want to skip those steps, I suggest the Platypus GravityWorks 4.0-Liter System. Without a unified standard, it’s important to be careful and do your research when purchasing a filter. (The FDA approves only chemical water purification products, like Potable Aqua or iodine tablets.) Though there are testing standards for water filters used by the military-I highly suggest looking into NSF protocol P248, which some brands use-they are not mandated for civilian products. ![]() As someone who’s had giardia and norovirus and picked something up in Peru 15 years ago that may still be hanging out in my intestines, I can tell you that the stakes are high. There is no governing body regulating the efficacy of physical filters. The world of backcountry water filters is a surprisingly scary one.
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