Not sure where to start? Tell the tool where your water comes from and what you’ve noticed about it. It’ll point you at what’s worth testing — and what actually fixes each problem, if a test confirms it.
Still in development. We’re stress-testing these recommendations and still finding things to fix. Don’t treat this as a final answer — verify it independently before you spend money. If something looks wrong, tell us — that’s genuinely useful.
What does your water actually need?
Three ways in, one honest answer out. This tool tells you what to look for and what to confirm — the contaminant you're dealing with, what genuinely removes it, and which filter certifications are necessary. It does not sell you anything, and it is perfectly willing to tell you the answer is “nothing.”
A note on what this is: a guide to criteria, not a checkout. We'll tell you which certifications a filter needs — never a product to buy. And the most common honest answer to “what do I need?” is “a test, not a system.”
Where do you want to start?
What are your senses telling you?
Pick the closest match. One rule worth knowing up front: the loud, dramatic stuff is usually the harmless stuff. The truly dangerous contaminants give your senses nothing — which is why every path here ends at the same place.
What did you find?
Select everything that applies — a test result, something on your utility's report, or a known concern. We'll give you the criteria for each.
Tell us about your water
1 — Where does your water come from?
2 — Anything here describe your situation? (Pick any that apply, or none.)
Here’s what to build
Based on what you flagged, here’s an actual treatment train — the stages, and the order to put them in. This is the shape of the system; which certified product fills each stage is the next step.
Here's what to look for
What your senses can't catch
The contaminants that actually threaten your health are the ones with no color, no smell, and no taste. You cannot see lead. You cannot taste arsenic or nitrate. No amount of staring at a clear glass will tell you whether they're there. The only honest way to know is a test.