Product Description Designed specifically for use in the four-stage Watts Premier RO Pure, RO Pure Plus, and Zero Pure Plus Reverse Osmosis Systems, the Watts Premier Sediment Pre-Filter effectively traps sediment, dirt, silt, and rust for clean, great-tasting drinking water. It is also compatible with the Pure UF-3 Filtration System. Please note this product will not fit the Watts 1/4 Turn Kwik-Change RO System. This high-performance replacement filter (WP105311) works to trap sediment and other particulate matter that affects the taste and appearance of your water, filtering particles as small as 5 microns, which is equivalent in size to milled flour. Refreshing hydration isn't the only thing that makes this top-performing 11-inch filter stand out; it is also equipped with a convenient user-friendly push-button release mechanism that allows for quick and hassle-free replacement without the need to shut off your water supply. This ease of replacement ensures that maintaining your water filtration system is as simple as possible, eliminating the need for specialized tools. Crafted from high-quality materials, the Watts Premier Sediment Pre-Filter is built for durability and maximum filtration efficiency. This construction not only guarantees a long-lasting performance but also ensures that it can withstand the demands of regular use. While the filter's life span may vary depending on local water conditions and usage patterns, we recommend replacing the membrane filter every 6 months or 1350 months. From the Manufacturer O-Pure/ Filter-Pure Sediment filter (stage 1) is a 5 Micron sediment filter. This Sediment filter traps sediment and other particulate matter, such as dirt, silt, and rust which affect the taste and appearance of your water. The filter is rated at 5 microns which is in the particle filtration category and is equivalent in size to milled flour. This filter is designed to be changed out every 6 months or 1350 gallons.