Pro Poly Guard Scale and Rust Preventer - 3 LB

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Poly-Guard Crystals are perfect for preventing hard water scale and iron build-up in water systems, equipment and appliances by forming a protective coating on the surface areas wi th continual exposure to water. Poly Guard is released through the Pro Poly Guard Cartridge, GP10C-ITEM linked HERE. How to use the Poly Guard Scale and Rust Crystals Transfer 1.5 pounds of crystals into the Pro Poly Guard Cartridge Preventing hard water scale, the crystals in the cartridge should be replaced every 30,000 gallons / 6 months to ensure product efficiency When your Pro Poly Guard Cartridge runs out, don't buy a new one- simply refill the cartridge with the Pro Poly Guard Crystals and reinstall the cartridge Specifications NSF 60 certified for drinking water Used to refill the Pro Poly Guard Cartridge 3 LB container that will treat up to 60,000 gallons of hard water Show more