​The Watts 10" replacement cartridge bundle includes all of the filters you need to keep your Watts W-525 50 GPD Certified Five-Stage Reverse Osmosis System working properly for a full year. The sediment pre-filter and carbon block pre-filters should be changed every 6-12 months depending on usage and water quality. The reverse osmosis membrane should be replaced every 24 months and the GAC post-filter should be replaced every 12 months.

The bundle includes:
    • Two 10” FPMB5-978 5 micron Sediment Pre-Filters
    • Two 10” F109009 5 micron Carbon Block Pre-Filters
    • Two 10” F109009 5 micron Carbon Block Pre-Filters
    • One 10” W-1812-50 50 GPD RO Membrane
    • Two 10” K2533KK Granular Activated Carbon Post- Filters (replacements for FI-CBA010J.38 filters)

NOTE: This item qualifies for free shipping within the 48 contiguous United States.