Sawyer Select S1 Replacement Filter: Foam Membrane and Durable Silicone

Designed to deliver effective filtration, the Sawyer Select S1 replacement filter comes in three varied options. Each model features a unique foam membrane, all encapsulated in a robust silicone bottle. Thanks to its advanced filtration technology using a 0.1-micron hollow fiber filter system, this device ensures optimal water purification. It effectively reduces chemical contaminants to levels of 0.5 parts per billion, as well as pesticide residues to just 0.01 parts per billion, far surpassing the standards recommended by the EPA.