Pool chemical calculator
Free, no sign-up. Enter the pool size and today's readings: we show how much chlorine, acid or other chemical to add, in what order, and the water balance (LSI).
What it works out
- Free chlorine targets from your stabilizer (CYA): minimum, target and shock
- Muriatic acid or dry acid to lower pH and alkalinity
- Baking soda to raise alkalinity, calcium chloride for hardness
- Stabilizer (CYA), and salt for salt pools
- The LSI before and after treatment, with the real water temperature
- Season and climate tips from the ZIP code
How to use it
- Enter the pool gallons and whether it is chlorine or salt.
- Type in the readings from your test kit (whichever you have).
- Pick the chlorine and acid you use. The calculator gives the doses and the order.
- Add chemicals in parts and re-test after 30 minutes.
Questions
Is the calculator free?
Yes. It is free, needs no sign-up and works on a phone.
What is the LSI?
The Langelier Saturation Index says whether water tends to etch plaster or leave scale. We work it out from pH, temperature, calcium and alkalinity.
Where do the numbers come from?
From Taylor Technologies (K-1005 kit), PHTA and CDC tables. Every formula has a unit test against those published values.
Does it work for salt pools?
Yes. Pick "Salt" as the pool type and the calculator uses salt-cell targets and tells you how much salt to add.
Running a pool route?
Keep every reading and dose per customer, with a report and photos. 60 days free.
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