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Potable Aqua Water Purification Tablets with PA Plus
$18, 0.21 ounces (net contents), www.potableaqua.com
The most economical option, Potable Aqua Tablets treats water in two steps. First, add the Potable Aqua Tablets, which reduce or remove waterborne contaminants that cause E. coli, cholera and salmonella. Then, after 30 minutes and add the PA Plus tablets to remove iodine color and taste. One downside is the wait—after adding the PA Plus Tablets, an additional 30 minutes is required before you can drink the treated water. The tablets are, however, proven effective against Giardia Lamblia. Potable Aqua suggests that you discard the opened bottles after one year. The tablets are packaged in small, glass bottles, so be careful when organizing your pack.