ANNUAL FILTER REPLACEMENT KIT: Say goodbye to unpleasant tastes and odors with the Watts Premier Annual 7-Pack Standard Water Filter Replacement Kit, a one-year supply of 3 types of filters that are tailored for specific filtration purposes, collectively ensuring crystal clear, great-tasting drinking water every time. HIGHLY EFFECTIVE FILTRATION: This kit includes two 5-Micron Sediment Filters (WP104017) for reducing dirt, silt, and rust that affects the taste and appearance of your water; four 5-Micron Activated Carbon Pre-Filters (WP101009) for conditioning the water and reducing chlorine tastes and odors; one 10" GAC (Granular Activated Carbon) Inline Post-Filter (WP100014) for removing chemicals that give objectionable odors or tastes to water, such as hydrogen sulfide or chlorine. VERSATILE COMPATIBILITY: These filters are designed for specific use with Watts Premier's 5-stage (WP500032) and 6-stage (WP521934) Reverse Osmosis Systems but are also conveniently compatible with any standard 10" filter housing for under sink home filtration systems. QUALITY CONSTRUCTION: These durable filters are crafted from high-quality materials for maximum filtration, with the carbon filters constructed from NSF certified coconut shell activated carbon. Filter life may vary based upon local water conditions or use patterns, but we recommend replacing sediment and carbon pre-filters every 6 months and the GAC post-filter once a year. THE PREMIER DIFFERENCE: Since our founding in 1989, Premier has been dedicated to the design, development, and marketing of high-quality water filtration systems that exceed industry standards. Following our Watts Water Technologies in 2001, our audience and influence have only expanded, solidifying Watts Premier as a trusted leader in the industry.