Leisure Time B-12 Defender for Spas and Hot Tubs 1 Quart 12 Pack

Use weekly for continued protection from scale Compatible with chlorine, bromine, ozone and biguanide sanitizers Use this product when the water is cloudy and weekly for continued protection from scale. For spas up to 800 gallons, use 2 oz. For spas over 800 gallons, use 4 oz. Add recommended dosage directly to spa. Turn on filter system and allow to circulate for 1 hour. 16 oz 12 Pack