Reduces many contaminants to provide bottled water quality water right at your kitchen sink for a fraction of the cost. Designed for use with municipal and private well water supplies. Replacement pre/post filter 2 pack for Whirlpool reverse osmosis system (fits systems WHAROS5, WHAPSRO and WHER25) System is certified to reduce numerous contaminants including chlorine taste and odor, sediment, cysts, lead, chemicals, and dissolved solids 6 Month filter life - replace your systems pre and post filter every 6 months as it is essential to change your filters on time to ensure your system is working properly UltraEase™ filter replacement - change filter in seconds with just a quarter turn – no hassles, no mess, no need to turn off your water supply NSF certified