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This is the one pool calculator that does it all: enter your pool volume and your test readings — free chlorine, pH, total alkalinity, calcium hardness and stabiliser (CYA) — and it tells you exactly which chemical to add and how much, for every reading that is out of range. No more guessing or running five separate calculations.
Test, type in the numbers, and follow the list. Each line names the product and the dose; the note tells you what order to add things in. It is the fastest way to get your water balanced and safe to swim.
Each reading is compared to its ideal range (FC 2-4, pH 7.2-7.8, TA 80-120, CH 200-400, CYA 30-50) and dosed toward the mid-target using standard per-10,000-gallon rates (e.g. baking soda ~1.5 lb raises TA ~10 ppm; calcium chloride ~1.25 lb raises CH ~10 ppm; cyanuric acid ~13 oz raises CYA ~10 ppm). Doses are approximate — always follow the product label and add in stages.
A 15,000-gallon pool reading low chlorine (1 ppm), low alkalinity (70) and low stabiliser (20) returns three fixes: add liquid chlorine, baking soda for alkalinity, and cyanuric acid for stabiliser — with the amount for each.