Expert Verified Updated: March 2026

Muriatic Acid pH Down Calculator

High pH can lead to scale and cloudy water. Calculate the volume of Muriatic Acid (Hydrochloric Acid) needed to bring your water back to balance.

Quick Conclusion
To lower pH from 8.0 to 7.5 in a 10,000-gallon pool, you need approximately 1 quart (32 oz) of 31.45% (20ะ ย ะฒะ‚โ„ขะ โ€™ะ’ยฐ Baume) Muriatic Acid. Dilute in a bucket of pool water before pouring for safer distribution.

Technical Comparison

pH Drop Target Acid (10k Gal) Acid (20k Gal)
-0.2 units 13 oz 26 oz
-0.4 units 25 oz 50 oz
-0.6 units 38 oz 76 oz

Actionable Steps

Pro-Tip

Storage: Never store Muriatic Acid near chlorine or in a metal shed. Even with the cap on, acid fumes can escape and cause severe metal corrosion or react violently with chlorine gas.

Frequently Asked Questions

What is the alternative?

Sodium Bisulfate (Dry Acid) is the most common dry alternative.

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