All Clear Spa Dry Acid

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Dry acid is used to lower pH and Alkalinity. 

To low pH you would need to disperse small amounts across the water. 

To lower Alkalinity the process is a bit different. You would add anywhere from 5oz - 15oz into the deepest area of the tub in a concentrated area to create a 'Bubble Effect' causing the Total Alkalinity to drop and only temporarily affecting the pH.

Active Ingredient.............. Sodium Bisulfate  94.5%

Available in 20oz, 2lb, or 6lb