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10 years in Navy SEAL teams. Clean water was mission-critical. Last year I built go-bags for my family. Bought the popular blue filter everyone recommends. Four of them. Three weeks ago I tested them. All four dead in the packaging. Stored correctly. Sealed. Handed one to my nine-year-old. She couldn't pull a single drop. Nobody tells you the popular filter has a 3-to-5 year shelf life. The membrane degrades in your bag. The one I replaced them with filters at 0.01 microns — ten times finer. 1,800 gallons. Doesn't clog. Never expires. Tonight, pull your filter out and hand it to your kid. If they can't drink through it on a Tuesday, they're not drinking through it on the day everything goes sideways.