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In hard water areas of the US, tap water can have very high calcium levels. In hot tubs and spas, high temperatures make it easier for excess calcium to come out of solution, forming uncomfortable crystals on your spa seating surfaces or on the chrome rings around your spa jets.
Spa Defender by Leisure Time keeps these minerals in solution, preventing scale formation which can clog up filters, heating elements and ozone orifices. Compare to Robarb Metal-X or Rendezvous Protect Plus spa metal removers. Just 2 oz. per week will protect your spa from hard water staining and scaling.
For metal problems in your water, such as iron, manganese, cobalt or copper – use Leisure Time Metal Gon.