*Lowers spa's water pH to ideal range of 7.2 to 7.6 ppm
*Stops eye irritation, cloudy water, and scaling caused by high pH
*Boosts chlorine’s ability to fight bacteria and algae
*Contains granular sodium bisulfate
*Recommended dosage: 6 oz. per 10,000 gallons. There is a 3 units minimum, if this is the only item you are ordering.