The Whirlpool Wheedf filter 2-pack contains replacement filters for the Whirlpool WHED20 dual stage drinking water system. The Whirlpool Wheedf Filter Pack has been NSF/ANSI Standard 42 and 53 Tested and Certified for the reduction of the following contaminants: Sediment Cysts Chlorine Taste and Odor Chemicals and Lead. The Whirlpool Wheedf includes a battery replacement for the EZ-Change Indicator Light. It is recommended that you replace the Wheedf filters every 6 months based on your water quality and usage. Remove filters and replace with new filters. Flush system for 10 minutes.