PoolDose is a pool chlorine calculator that tells you how much to add, not just what is wrong. Enter the size of your pool and the product you actually own, and it gives the exact grams or millilitres to put in, instead of a vague instruction to raise the pH.

Volume is calculated properly, as a good pool calculator should. Rectangular, oval, round, kidney and stepped-bottom pools are all supported, and a sloped bottom is calculated rather than guessed from the deepest point.

Dosing covers chlorine in its four forms (liquid sodium hypochlorite, calcium hypochlorite, trichlor and dichlor), pH up and pH down using soda ash, sodium bisulfate or hydrochloric acid, alkalinity, calcium hardness, stabilizer, flocculant and algaecide, plus a pool salt calculator for a salt chlorinator. Each form has a different strength and a different side effect on stabilizer or hardness, so as a pool chemical calculator the result is always in the product sitting in your pump room.

The water index uses the Langelier Saturation Index. From temperature, pH, alkalinity, hardness and stabilizer it tells you whether the water will corrode surfaces or form scale before you add anything, and what to fix first.

A water test log with a ninety-day chart keeps your readings, with support for several pools, testing reminders and CSV or PDF export. A maintenance guide explains the correct order for fixing things: alkalinity, then pH, then chlorine, then stabilizer.

Values are orientative. Always follow the manufacturer's label, which takes priority over any number the app shows.