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

The bundle includes:
    • Two 10” FPMB5-978 5 micron Sediment Pre-Filters
    • Two 10” F109009 5 micron Carbon Block Pre-Filters
    • One 10” W-1812-50 50 GPD RO Membrane
    • Two 10” AICRO Granular Activated Carbon Post-Filters

​NOTE: Orders over $99.00 qualify for free shipping within the 48 contiguous United States.