ABOUT THIS PRODUCT
The Watts Premier RO Pure 4-Pack Filter Kit (model WP531152) is a complete annual replacement filter set for compatible Watts Premier under-sink reverse osmosis systems. The kit includes four filters — a 5-micron sediment filter, a 5-micron activated carbon pre-filter, a carbon post-filter, and a 50 GPD reverse osmosis membrane — covering all four stages of filtration in one purchase. Together, these filters work to reduce contaminants including lead, arsenic, nitrates, copper, chlorine, sediment, silt, and rust, helping deliver clean, great-tasting drinking water.

Each of the four 11-inch filters is color-coded for easy identification: red for sediment, yellow for pre-filter, blue for post-filter, and green for membrane. A push-button release design allows for tool-free filter changes without shutting off the water supply. Recommended replacement intervals are every 6 months for sediment and carbon pre-filters, annually for the post-filter, and every 2 to 5 years for the membrane. The kit is ANSI certified and weighs approximately 2.9 pounds.

COMPATIBILITY / FITMENT
This filter kit is designed for use with the Watts Premier RO Pure systems (WP531411, WP531407) and Zero/Pure Plus systems (WP531517, WP531417). It is not compatible with Watts 1/4 Turn Kwik-Change RO systems.