The Ninety PHO Scale Inhibitor Replacement Cartridge is designed for whole-home water filter systems, effectively preventing limescale buildup in pipes, boilers, and heating equipment — keeping your home's water infrastructure running efficiently for longer.
Key Features
Scale inhibition: Polyphosphate beads slowly release protective agents that bind with calcium and magnesium ions, preventing scale formation
Water softening: Reduces water hardness, protecting appliances and plumbing from corrosion and mineral deposits
Universal fit: Standard 4.5" × 20" size — compatible with most whole-home filter housings on the market
Easy replacement: No modifications required, installs in minutes
Long-lasting performance: Silica-phosphate bead fill for sustained, consistent protection
Technical Specifications
Cartridge size: 4.5" × 20" (standard Big Blue format)
Filter media: Polyphosphate (PHO) silica beads
Function: Scale inhibition, water softening, corrosion protection
Compatibility: Most standard whole-home filter housings
Replace every 6–12 months depending on your local water hardness and household consumption. Regular replacement ensures optimal scale protection and water quality.
Ideal for homes with hard water, protecting boilers, washing machines, dishwashers, and all plumbing from costly limescale damage.
