The EcoPure carbon block filter (2 pack) reduces chlorine taste and odor which is the number one culprit of bad tasting water within homes with a municipal water supply. This filter also reduces sand, silt, rust and sediment, which will extend the life of water using appliances. These filters fit most other brands of whole house water filtration systems. The EcoPure carbon filter is the universal size meaning it is compatible with GE, Whirlpool, Culligan, Omni, DuPont, Filtrete, 3M, Watts and most standard size water filtration systems. These filters are NSF certified and filter down to 5 microns and work great on both well water and municipal water supplies.