Pro Products Poly Guard 3 LB Crystals

Pro Products Poly Guard® Crystals offer a cost-effective, NSF‑60 certified scale and rust prevention solution for up to 30,000 gal of potable water—ideal for use in a 10″ filter cartridge.

• Scale & corrosion control: Forms a protective coating on plumbing and appliances to prevent hard-water scale and iron staining 

• High treatment capacity: Treats up to 30,000 gal (≈200 ppm hardness or 17 ppm iron) per 3 lb jug; 1 lb treats ~20,000 gal 

• Safe, food-grade phosphate formula: Slow-dissolving, NSF/ANSI‑60 certified crystals safe for drinking water systems

• Cartridge refillable: Designed for use in standard 10″ housings—refill the cartridge without full replacement 

• Low maintenance: Replace crystals every six months or after 30,000 gal to maintain effectiveness.