Muriatic acid dose by pool volume

How much 31.45% muriatic acid takes pH from 7.8 to 7.5 at 100 ppm alkalinity, at every common pool volume. Open a volume for other starting readings and acid strengths.

Every dose below is worked out for that exact volume. If yours is not on the list, the calculator takes any number.

Pool volume	Muriatic acid 31.45%, pH 7.8 to 7.5
5,000 litres	35 mL
7,000 litres	48 mL
10,000 litres	69 mL
15,000 litres	104 mL
20,000 litres	138 mL
25,000 litres	173 mL
28,000 litres	193 mL
30,000 litres	207 mL
35,000 litres	242 mL
40,000 litres	276 mL
45,000 litres	311 mL
50,000 litres	345 mL
60,000 litres	414 mL
70,000 litres	483 mL
80,000 litres	552 mL

Alkalinity decides how much acid it takes

How much acid a pH correction takes depends on alkalinity as much as on pH, because alkalinity is the buffer resisting the change. A pool sitting at 150 ppm needs far more acid than the 100 ppm assumed here. Acid also lowers both readings together, which is why the standard fix for high pH and high alkalinity is acid plus aeration rather than one product for each.

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