![]() These pores trap bacteria, parasites, and all but the very finest sediment that may be in the water. Water first passes through a hollow fiber membrane filter-a tangle of thin polymer tubes with 0.2-micron pores in their walls. The LifeStraw filter consists of two filter elements. We experienced some slowing of filtration over the Pur Lead Reduction filter’s 40-gallon lifespan, but not outright clogging. But in our testing, the Longlast+ frequently clogged well before then, and numerous owners report the same problem. Brita’s competitor, the Longlast+, is certified for more contaminants (30) and is also rated to last three times longer (120 gallons versus 40). ![]() It’s also certified for four “aesthetic” ANSI/NSF Standard 42 contaminants that affect water taste (especially chlorine) 10 ANSI/NSF Standard 53 contaminants (encompassing organic compounds including pesticides, and heavy metals including mercury and cadmium), and eight ANSI/NSF Standard 401 “emerging contaminants,” which are increasingly found in US water supplies (including bisphenol A and estrone, a form of the human hormone estrogen). Pur’s Replacement Filter with Lead Reduction (model number PPF951K) is ANSI/NSF–certified for 23 contaminants, including (obviously) lead. The heart of any water-filter system is the filter itself, so let’s start there. ![]()
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