BIO-DEX PAODR 55 gal Drum Protect-All Supreme safely removes and prevents stains and scale/calcium buildup below the waterline. Results can be seen typically within 48 hours. This is the product of choice in areas with hard water problems. It removes many types of organic stains. Protect-All Supreme is an effective tool for new pool startups, newly filled pools, spring pool startup, seasonal winterizing and ongoing maintenance. It can also be used on spas, hot tubs and decorative pools.