Water Softening Cartridges

SpiroPure water softening replacement cartridges offer whole house water softener filtration in a 10x2.5, 10x4.5, 20x2.5, or 20x4.5 options to fit in standard-sized filter housings. Cation resin beads help reduce hardness and scale deposits from water using ion-exchange. Ideal for residential and low-commercial water softening applications. Employ the cartridge on the water line to protect your plumbing pipes, appliances, and fixtures from hard water spots and buildup.

Water Softening Filter Cross Reference Chart

Size SpiroPure Pentek
WS Series

WS Series

Water Softening Resin

2.5" x 10"
  • WS-10 / 155319-43
2.5" x 20"
  • WS-20 / 155320-43
4.5" x 10"
4.5" x 20"
  • WS-20BB / 155321-43