Then, measure the amount of sodium bisulfate needed and mix this with a bucketful of water from the tub. Before adding sodium bisulfate, test the water so you know the total alkalinity. ![]() This is a dry acid that can be added to the water to reduce the alkalinity. Although pH and alkalinity are different, decreasing the pH usually works to decrease the alkalinity too. Wait for 24 hours and then retest the water. Test the water and add the appropriate amount of pH decreaser. You probably have a pH decreaser as part of the spa maintenance kit. There are a few different ways to do this.
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