Watts Kwik Change 11 RO Replacement Water Filter Kit WQC4RO-FILTERKIT|WQCM11-50. Watts Kwik Change 11RO Replacement Water Filter Kit Features: Watts Kwik Change 11RO Replacement Water Filter Kit Features: The Watts Kwik Change RO Replacement Water Filter Kit delivers a comprehensive one year source from filters for your WQC4RO Kwik Change switch osmosis unit. This set consists of the sediment as well as carbon dioxide prefilters carbon dioxide postfilter in addition to the membrane. Package consists of: Qty. 2 from WQCSC11 - 11Sediment Prefilter Qty. 2 from WQCCC11 - 11Carbon Prefilter Qty. 1 from WQCGAC11 - 11Carbon Postfilter Qty. 1 from WQCM11-50 - 1150 gpd Membrane Product Note: These filters will certainly NOT suit the Watts Premier RO Pure RO-4 Reverse Osmosis System If you have one of these devices feel free to click here. Watts WQC4RO11 Kwik Change RO System.