SeaKlear® 90573SKR 1 qt Bottle Metal Klear 12 per Case. Metal Klear controls metal build-up and surface staining. Metal Klear is a highly effective formula that helps control metal based staining in pools. As Metal Klear is a phosphate-free formula, it can be used in pools with salt systems. This special formulation is designed to control metals from dropping out of solution and also works to help clear discoloration of water caused by metals. NOTE: If the pool has existing metal stains on the surface, treat first with SeaKlear Metal Stain Remover to pull stains out of the surface. Then follow up with Metal Klear as directed.