A plain-language reference for every pool chemistry term. What each one means, what range to aim for, and why it matters. No jargon, no fluff.
The active chlorine in your water — what actually sanitizes. Target depends on your CYA level.
Spent chlorine bound to organics — the source of "pool smell."
Coming soonFree chlorine plus combined chlorine — the sum your test kit may show.
Coming soonThe compounds responsible for "chlorine smell" and eye irritation — and why the fix is more chlorine, not less.
The shock level that destroys chloramines and resets your chlorine.
Coming soonA direct measure of sanitizing strength, used widely in EU and pro systems.
Coming soonHow acidic or alkaline your water is. Affects chlorine effectiveness.
Coming soonThe buffer that keeps pH stable. Too high makes pH unmanageable.
Coming soonHow much calcium is dissolved in your water. Too high = scale.
Coming soonThe water balance number that ties pH, TA, CH, and temp together — and why most calculators get it wrong.
The chloride that lets a salt water generator make chlorine.
Coming soonEverything dissolved in your water — minerals, salts, chemicals.
Coming soonAlgae food. Where it comes from and whether you should worry.
Coming soonOptional additive that buffers pH and inhibits algae growth.
Coming soon
