Know Your Water

Most water guidance stops at boil it. That is not much help when you are standing in front of a creek, a rain barrel, a hot water heater and a swimming pool, deciding which one to touch first.

This handbook ranks the sources most households actually have access to, tells you what each one is likely to carry, and gives you the order to use them in. It covers the difference between physical filtration and chemical treatment in plain language — a pore size stops anything bigger than the pore, and dissolved chemicals go straight through, looking and tasting exactly the same on the other side.

It also names the four sources that no portable filter makes safe: saltwater, pool water, anything that smells of fuel or solvent, and street or industrial runoff. Knowing those four is worth more than any specification on a box.

Delivered as an illustrated PDF, 9 pages, formatted for both screen and home printing. Instant download after checkout.