Defender is a second-generation blend of organic polymers designed to prevent scale formation, aid in the removal of existing scale and prevent precipitation of dissolved solids in spas or hot tubs.

Once spa or hot tub water becomes saturated with minerals (dissolved solids), salts begin to deposit. The deposited salts then serve as reaction sites on which new calcium crystals begin to grow. Defender interferes with the rate and normal pattern of growth. Once crystal growth is altered, calcium buildup is inhibited. Defender protects your heating and plumbing equipment from damaging calcium build up and corrosion.