Whirlpool WHEERF Reverse Osmosis Replacement Pre/Post Water Filters (Fits Systems WHAROS5, WHAPSRO & WHER25) Replacement Whirlpool reverse osmosis pre/post filter 2 pack (fits systems WHAROS5, WHAPSRO & 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. 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 Made In The USA