Directions for use: Maintenance Dosage 1. With pump on, add 1/2 teaspoon of this product per 100 gallons (380L) of water or 5 teaspoons per 1,000 gallons (3,800L) as initial treatment 2. Repeat at 15-20 minute intervals until a residual of 3-5ppm of available chlorine is established as determined by a test kits 3. A test kit must be used regularly to determine the frequency of additional doses of this product needed to maintain the chlorine residual of 3-5ppm Superchlorination 1. Use 1 teaspoon of this product per 100 gallons (380L) of water or 1/4 cup per 1,000 gallons (3,800L) 2. Superchlorination may be needed on a nightly basis in a heavily used spa or as infrequently as once a week in a moderately used spa Reentry Reentry into treated spas or hot tubs is prohibited above levels of 3ppm of chlorine due to risk of bodily harm