Why does this muriatic acid calculator ask for alkalinity?
Total alkalinity buffers pH movement. A pool at 140 ppm alkalinity usually needs more acid to move from pH 8.0 to 7.5 than the same pool at 70 ppm alkalinity.
Free Pool Tool | Ellis County, TX
Pool Muriatic Acid Calculator
Lower pH with a conservative acid dose that accounts for pool gallons and alkalinity.
Calculator
Enter your pool numbers
Fractions like 1/4 or 1/8 work in number fields. Results are planning estimates, not a binding service diagnosis.
Result
20 fl oz Muriatic acid 31.45%
Acid demand changes with alkalinity. Dose conservatively, circulate, then retest.
Approximate cups2.5 cups
pH change7.9 to 7.4
Pro Take
You can do this yourself. Or you can stop chasing it.
Don't love handling muriatic acid? You do not have to. A&M tests, doses, and balances pools weekly without you opening the bottle.
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How to test
Get the reading before you dose
Use fresh pH and total alkalinity readings before adding acid.
- Wear gloves and eye protection.
- Never mix muriatic acid with chlorine.
- Pour slowly in the deep end with the pump running.
Companion Guide
How to Safely Lower Pool pH with Muriatic Acid
Read the paired blog post for the plain-English version of the chemistry, testing, and common homeowner mistakes.
Read the guideFAQ
Muriatic Acid Calculator FAQs
Which acid strength should I select?
Select the strength printed on your bottle, usually 31.45% or 14.5% muriatic acid. A weaker acid requires more fluid ounces for the same pH correction.
Should I dose the full acid result at once?
For a large pH drop, add part of the result, circulate, and retest before adding more. The calculator is intentionally conservative because acid demand is an estimate, not a lab titration.