To lower pH we recommend using No Mor Muriatic Acid or - if not available - liquid acid. This will lower the pH strongly. We recommend a pH range of 7.8 to 8.2. Refer to the Hamilton Index for additional information.
We also recommend first balancing (i.e. lowering) your Total Alkalinity prior to adjusting pH. Some of the acid will be consumed lowering your Total Alkalinity.
You will need to perform an acid demand test. For reference, the table below is a rough estimate on how much acid you'll need:
No Mor Muriatic Acid per 10,000 gallons
Liquid (Muriatic) Acid per 10,000 gallons
5 ounces (one capful)
1/2 Quart (16 fl. oz.)
10 ounces (two capfuls)
1 Quart (32 fl. oz.)
15 ounces (three capfuls)
1.5 Quarts (48 fl. oz)
1 pound 4 ounces (4 capfuls)
1/2 Gallon (64 fl. oz.)
1 pound 9 ounces (5 capfuls)
1 Gallon 1/2 Quart (80 fl. oz.)