Defend Against Stain & Scale Formation Leisure Time Defender uses a unique blend of organic polymers to remove existing scale formation and prevent future scale formation. The formula prevents precipitation of dissolved solids in spas and hot tubs. Leisure Time Defender is compatible with chlorine bromine ozone and biguanide sanitizers and is easy to use. How to Use Leisure Time Defender Use Leisure Time Defender when water is cloudy. For long lasting results and less spa upkeep use the product weekly. For spas up to 800 gallons use 2 fl. oz. of Defender. In spas and hot tubs over 800 gallons use 4 fl. oz. After using the formula turn the filter system on and let it run for 1 hour. Ease Into Simple Spa Care With the simple routine from Leisure Time you can reduce water care time for a more relaxing spa experience. Ease into simple spa care with Leisure Time.