This Watts 531155 Premier RO water filter replacement kit provides a complete one year supply of water filters for your RO Pure RO-4 system. This kit includes sediment and carbon prefilters, a, carbon postfilter, and an RO membrane. The filters feature high-quality media to reduce sediment, dirt, rust silt, chlorine, tastes, and odors from your drinking water. They also prepare your water for the reverse osmosis process and condition it before and after reverse osmosis.

The Watts Premier RO system has four stages. At each stage, your water passes through a water filter. This replacement filter kit includes all the filters your reverse osmosis system needs for a year.

(2) Sediment 105311 Prefilters. Trap sediment and other particles such as dirt, silt, and rust for better looking and tasting drinking water. Change the sediment filter every 6 months.

(2) Carbon 105351 Prefilters. Active carbon removes chlorine, enhances taste, and conditions water to prepare it for RO treatment. Change the carbon filter every 6 months.

(1) GAC Carbon 105341 Postfilter. Granular activated carbon (GAC) further enhances flavor of water while conditioning and reducing chlorine. Change the GAC filter every 12 months.

(1) 50 GPD 105331 Membrane. The reverse osmosis membrane effectively reduces arsenic, lead, nitrates, perchlorate, chromium, copper, dissolved solids and cysts. Change the RO membrane every 12 months.

Changing the filters takes just a few simple steps: To remove the filter, lift it, press the button to unlock the filter, and pull it out. To insert the new filter, remove its cap and push it in place.

PRODUCT NOTE: These filters will NOT fit the WQC4RO11-50 50 GPD Watts 1/4 turn Kwik Change RO System, or the WQC4RO13-100 100 GPD Watts 1/4 turn Kwik Change RO System. If you have one of these systems, please navigate to the system pages by following the hyperlinks.



Have questions about reverse osmosis systems and filters? Take a look at our RO FAQ Guide for answers.