20" 2 Stage Big Blue Whole House Water Filter System with Sediment and Carbon Filters Simple in/out connection instructions allow for most homeowners to install themselves Ball valve and pressure release allows for simpler filter changes with less mess Sediment filter removes sediment & particulates, providing cleaner, clearer water Carbon filter removes odors, tastes, and chemicals, including chlorine, herbicides, and pesticides Designed for 2-4 bathrooms homes with 3-6 people