pH decreaser (muriatic acid) calculator
PROMuriatic acid (31.45%) to lower pH.
Short answer: fl oz ≈ (gal/10k) × (ΔpH/0.2) × 10 × (TA/100). 20,000 gal, -0.4 pH at TA 100 = 40 fl oz muriatic. Enter your measurements above and the ph decreaser (muriatic acid) calculator returns the quantity, unit conversions and an estimated cost instantly, in imperial or metric — no sign-up needed.
What do you need to measure?
What is the answer?
Muriatic acid
40.0 fl oz
Cups (8 oz)
5.0
How does the ph decreaser (muriatic acid) calculator work?
fl oz ≈ (gal/10k) × (ΔpH/0.2) × 10 × (TA/100).
What does a worked example look like?
20,000 gal, -0.4 pH at TA 100 = 40 fl oz muriatic.
What do people ask most?
›Also lowers TA
Yes — planned acid dosing is how you drop TA.
›Dry acid alternative?
Sodium bisulfate — safer to handle but adds sulfates.
Which pool calculator should you use next?
Where can you learn more?
Read field notes on estimating and materials, or browse every calculator we make.
What should you read before you order materials?
Field notes from real jobs that explain the numbers behind this calculator.
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