Muriatic acid chart for alkalinity
How much 31.45% muriatic acid lowers total alkalinity, by pool size and ppm, from 5,000 to 40,000 gallons.
| Gallons | Lower alkalinity by 10 ppm | Lower alkalinity by 20 ppm | Lower alkalinity by 30 ppm | Lower alkalinity by 40 ppm | Lower alkalinity by 60 ppm |
|---|---|---|---|---|---|
| 5,000 | 13 fl oz | 26 fl oz | 39 fl oz (1.2 qt) | 52 fl oz (1.6 qt) | 78 fl oz (2.4 qt) |
| 8,000 | 21 fl oz | 42 fl oz (1.3 qt) | 62 fl oz (1.9 qt) | 83 fl oz (2.6 qt) | 125 fl oz (3.9 qt) |
| 10,000 | 26 fl oz | 52 fl oz (1.6 qt) | 78 fl oz (2.4 qt) | 104 fl oz (3.2 qt) | 1.22 gal |
| 12,000 | 31 fl oz | 62 fl oz (1.9 qt) | 94 fl oz (2.9 qt) | 125 fl oz (3.9 qt) | 1.46 gal |
| 15,000 | 39 fl oz (1.2 qt) | 78 fl oz (2.4 qt) | 117 fl oz (3.7 qt) | 1.22 gal | 1.83 gal |
| 18,000 | 47 fl oz (1.5 qt) | 94 fl oz (2.9 qt) | 1.10 gal | 1.46 gal | 2.19 gal |
| 20,000 | 52 fl oz (1.6 qt) | 104 fl oz (3.2 qt) | 1.22 gal | 1.62 gal | 2.44 gal |
| 25,000 | 65 fl oz (2.0 qt) | 1.02 gal | 1.52 gal | 2.03 gal | 3.05 gal |
| 30,000 | 78 fl oz (2.4 qt) | 1.22 gal | 1.83 gal | 2.44 gal | 3.66 gal |
| 40,000 | 104 fl oz (3.2 qt) | 1.62 gal | 2.44 gal | 3.25 gal | 4.88 gal |
How to read it
About 26 fl oz of 31.45% muriatic acid lowers alkalinity 10 ppm in 10,000 gallons. It also lowers pH, so split big doses and retest.
These are estimates from commonly used dosing figures. Products vary, so follow the label and SDS, add chemical to water, never mix chemicals, and test again after circulating. Local code may set different ranges.
For an exact number on any pool, use the chlorine and acid and alkalinity calculators, or read Lowering pH with muriatic acid.