How to use:
1. Initial Treatment: ADD PREVENT II directly to the water at a rate of 4 oz. per 500 gallons when the spa/hot tub is initially filled.
2. Turn on filtration system to circulate the water for 1 hour before adding disinfectant.
3. Weekly Treatment: ADD PREVENT II at a rate of 2 oz. per 500 gallons of spa/hot tub water.
Size: 16 fl oz.