When your Pro Poly Guard cartridge runs out don't buy a new one. Simply refill the cartridge with economical Pro Poly Guard Crystals, reinstall, and you're back in business. Your appliances, plumbing, and other vulnerable surfaces will be protected from scale build-up and corrosion for up to 60,000

• 3 lb. container will treat up to 60,000 gallons of hard water
• Used to refill the Pro Poly Guard cartridge
• NSF 60 certified for drinking water use