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
How to use the dose
How to safely add muriatic acid
Test pH and alkalinity, calculate a conservative dose, add it safely with the right gear, and retest before adding anything else.
- Test pH and alkalinityUse fresh pH and total alkalinity readings — alkalinity buffers pH movement, so a high-TA pool needs more acid for the same drop.
- Calculate the doseRun this calculator with your gallons, pH, alkalinity, and acid strength — for a large pH drop, dose part of the result first.
- Pour slowly at the deep endWear gloves and eye protection, pour slowly and low to the water at the deep end with the pump running, and never mix acid with chlorine.
- Wait and retestWait 30 minutes before retesting pH, and wait 4-6 hours before adding any other chemical.
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.