Whole House Water Filter Cartridge 4.5 x 20 Scale Inhibitor

Whole house water filter replacement cartridge helps reduce limescale and protect plumbing by controlling hard-water minerals before they reach fixtures and appliances. This 4.5" x 20" polyphosphate scale inhibitor filter uses siliphos beads to bind calcium and magnesium, helping prevent buildup in pipes, water heaters, and heating equipment. Designed as a universal cartridge for many whole home filtration systems, it installs quickly and supports steady flow with long service life.

• Delivers anti-scale protection by targeting calcium and magnesium to reduce mineral buildup in pipes and heaters


• Fits standard 4.5" x 20" (Big Blue) housings used in many whole house filtration systems


• Helps protect appliances by reducing corrosion and scaling linked to hard-water minerals


• Lasts up to 12 months and filters up to 100,000 gallons (performance varies by water quality)


• Includes glue-free construction with polypropylene core and siliphos beads for clean, odorless water

Keep your whole home filtration system working efficiently with a universal scale inhibitor cartridge built for high-capacity use. The slow-release polyphosphate media helps minimize hard-water damage that can shorten the life of water heaters, boilers, and plumbing lines, while supporting better-tasting, better-smelling water at the tap. Ideal for preventative maintenance in homes with hard water, this replacement filter installs without special modifications in compatible housings. Grab yours today and stay ahead of scale before it becomes an expensive repair.

• Type: Polyphosphate scale inhibitor replacement cartridge


• Size: 4.5" x 20" (115 x 115 x 507 mm)


• Material: Polypropylene core + siliphos beads


• Capacity: Up to 100,000 gallons (varies by water quality)


• Service life: Up to 12 months (varies by water quality)


• Quantity: 1 pc


• Net weight: 3.7 lb (1.7 kg)