20" 2 Stage Big Blue KDF-85 Whole House Complete Water Filter System with Sediment and GAC/KDF 85 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 GAC/KDF 85 filters out unpleasant tastes, odors, chemicals, & &lt;b&gt;hydrogen sulfide.&lt;/b&gt; Designed for 2-4 bathrooms homes with 3-6 people