Poly-Guard® Scale & Rust Preventer, Crystal Cartridge

  DESCRIPTION SCALE & RUST PREVENTER PREVENT HARD WATER & RUST Poly-Guard Crystal is an economical and safe way to treat hard water and iron in the water without the use of a water softener. Poly-Guard slowly dissolves food grade crystals into the water supply, protecting plumbing and water-using appliances from corrosion and hard water. In addition, the Poly-Guard extends the life of your plumbing and appliances by leaving a protective coating on the interior walls. This coating of the plumbing also has the added benefit reducing the leaching of copper and lead into drinking water. One Poly-Guard Cartridge will last up to six months while treating up to 30,000 gallons of water. Poly-Guard sequesters hard water (maximum 12 grains per gallon hardness), reducing scale build up, and sequesters low levels of iron (maximum 1 part per million iron), reducing hard water rust staining. Temperature range 40-125º F (4.4-37.8º C). This product is NSF Certified to meet NSF/ANSI/CAN Stand