The Water Filter Men Water Filter For Home Appliance And Water Boiler Limescale Descaler With Polyphosphate PROTECT HOME APPLIANCES FROM SCALE BUILD-UP POLYPHOSPHATE CRYSTALS INSIDE A REFILLABLE CARTRIDGE INSIDE A 5" HOUSING Water Filter for Home Appliance and Water Boiler Limescale Descaler with Polyphosphate TheWaterFilterMen Branded CTM-012791588 PROTECTS THE PIPE FROM SCALE BUILD UP , CORROSION AND STOPS RUST AND DUST PARTICLE BUILD UP