Feb 08, 2014 · The Lifestraw, whose glowing Amazon reviews leave me endlessly perplexed. The Lifestraw is a hollow-membrane filter built into a straw. You place the straw into the water, and drink. Sucking the water up through the straw forces it through the filter, which removes 99.9999% of bacteria, and 99.9% of protozoa, down to 0.2 microns, with a filter