POLY GUARD
Corrosion Control: To prevent hard water scale, Poly Guard is typically administered through the Poly Guard Cartridge. The cartridge fits 10″ standard whole house filter housings. The cartridge will hold 1.5 pounds of crystal and treat up to 30,000 gallons of water. These crystals will not dissolve completely and should be replaced in 30,000 gallon intervals or every 6 months to ensure product efficacy.