Regular use of Leisure Time Defender will prevent mineral buildup from occurring, which can cause the spa's heater or equipment to fail. This stain and scale control chemical is the perfect follow up to Leisure Time Metal Gon and can be applied at start-up. Compatible with all hot tub sanitizing chemicals and spa sanitizing chemicals, this hot tub defender will keep you enjoying your relaxing time in the water all season long. About the Brand: Leisure Time was developed for use in spas, hot tubs, and jacuzzies. Our water care products are both economical and powerful enough for the toughest jobs. Within Leisure Time?s wide selection of products, we offer everything from algaecides and deposit control formulas to non-chlorine shock treatments, powerful surface cleaners, clarifiers, enzyme-based cleaners, and more. If you like using Leisure Time, check out some of the other similar brands from our parent company, Sigura. With brands like HTH, Applied Biochemists, GLB, Spa Selections, and PooLife, Sigura has a long heritage and more than a century of experience in developing innovative water treatment solutions for use in pools, lakes, ponds, hot tubs, and more. At Sigura, we have an unparalleled passion, pride, and commitment to delivering superior water treatments that improve the environment and enhance the security, health, and safety of the global communities we serve. With our track record of innovation and simple, intuitive solutions that anticipate needs, Sigura customers feel more secure as they enjoy their pools, spas, ponds, and lakes.