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Free pool tool
Pool chemical calculator
How much chlorine, baking soda, stabilizer or salt to add, from your pool's volume and your test results.
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Add in portions and retest. Never mix chlorine products with each other or with acid. Dichlor and cal-hypo also add CYA and calcium.
Questions
How much liquid chlorine to raise FC by 1 ppm?
About 12.8 fl oz of 10 % liquid chlorine per 10,000 US gallons. Bleach is weaker: 6 % bleach needs roughly 21 fl oz for the same rise.
What FC should I aim for?
It depends on your stabilizer (CYA) level: the higher the CYA, the more free chlorine you need. PoolPro uses Trouble Free Pool's FC/CYA chart for targets.
Where does the math come from?
Chlorine strength follows the same bleach density formula as TFP Pool Math; baking soda raises total alkalinity by 1 ppm per 1.68 mg per litre; stabilizer and salt are added at their label purity.