PoolSure: Pool Calculator

Enter your test results and get the exact amount of your own product to add — in a safe order, with safety rules built in. No account, no ads.

PoolSure turns your pool or hot tub test results into a clear, step-by-step plan: what to add, how much of your own product, and in which order.

DOSES FOR THE BOTTLE YOU ACTUALLY HAVE Pick your product and confirm the strength printed on its label — 10% or 12.5% liquid chlorine, 150 g/L, cal-hypo, trichlor, dry acid, pH minus and more. Doses are calculated from chemistry, not guessed from a generic table, and always rounded down to the safe side.

SAFETY BUILT IN • Acid and chlorine are never in the same step — the plan makes you circulate in between • Big corrections are split into parts with a retest in between • Warnings when two of your products must never be mixed • Clear “safe to swim” status after shocking • Doses that rely on a model are marked “Estimate”

POOLS AND HOT TUBS Chlorine, salt systems, bromine and active oxygen. Any size, from a small hot tub to a large pool. A volume calculator helps if you're not sure.

A LOG THAT KNOWS YOUR WATER Every test and every dose is saved on your device. PoolSure tracks how stabilized chlorine slowly builds up stabilizer (CYA) and calcium between tests.

YOUR COUNTRY, YOUR UNITS Product presets and target ranges for the US, Canada, the UK, Australia, France, Germany, Italy, Spain, Mexico and Brazil. Metric or US units. English, French, Spanish, Portuguese, German and Italian.

PRIVATE BY DESIGN No account. No server. No ads. No tracking. Works offline. Backups are a single file you keep.

FREE, WITH AN OPTIONAL ONE-TIME PRO Testing, dosing, the full log and backups are free forever. Pro (one payment, no subscription) adds several pools and hot tubs and trend charts.

Doses are calculations, not professional advice. Always follow the product label.

Pro is a one-time, non-consumable purchase — no subscription, no renewal. Restore it any time from Settings.

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