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 & 53 Tested and Certified for the reduction of the following contaminants: Sediment, Cysts, Chlorine Taste & Odor, Chemicals and Lead. The WHEEDF set 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. The WHEEDF has a capacity of approximately 270 gallons.