The Watts 13" replacement cartridge bundle includes all of the filters you need to keep your Watts Quick-Change 100 GPD Four-Stage Reverse Osmosis System working properly for a full year. The sediment and carbon block pre-filters should be changed every 6 months. The granular activated carbon post-filter should be changed every 12 months. The reverse osmosis membrane should be replaced every 24 months.

The bundle includes:
    • Two 13” WQCSC13 Sediment Pre-Filters (Red)
    • Two 13” WQCCC13 Carbon Block Pre-Filters (Yellow)
    • One 13” WQCM13-100 100 GPD RO Membrane (Green)
    • One 13” WQCGAC13 Granular Activated Carbon Post-Filter (Blue)

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