Pool Chemistry Guides
A calculator tells you how much. These explain why the dose is what it is, what order to do things in, and how to know when the water is safe again — the parts a number on its own leaves out.
Every figure here is checked against CDC guidance and EPA-registered product labelling, and the sources are listed on each page. Your own product label always takes precedence.
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How Much Muriatic Acid to Lower Pool pH?
About 10 fl oz of 31.45% acid per 10,000 gallons lowers pH by roughly 0.2.
The dose depends on volume, current pH, target pH and alkalinity — and alkalinity is the one everyone leaves out. Includes a dosing table and the safe order to add it in.
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Pool Shock Dosage Chart
1 lb of cal-hypo per 10,000 gallons for maintenance; double for cloudy, triple for green.
Cal-hypo, dichlor and liquid chlorine dosed separately by pool volume, for maintenance, cloudy and green water — with what each one leaves behind in your water.
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When Is It Safe to Swim After Shocking a Pool?
When a test shows free chlorine at 4 ppm or below.
Re-entry is decided by a chlorine reading, not a waiting time. What the EPA label limit means, how to test for it, and why a fixed number of hours is not a safety rule.
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