Replacement Water Softener Tank with Riser Tube and 1 Cubic ft of the Highest Quality and Capacity 10% Cross Linked Cation Softening Resin + Gravel. 2.5" Opening accepts most standard Control heads, including Fleck, autotrol, clack, and most Culligan control heads If you would like to upgrade your Softener to a Softener + Filter in One, add a KDF Media Guard to your purchase. You can still use the same valve/meter for the water softener system with a MediaGuard. No Changes Necessary. Valves Not Included For our KDF 55 MediaGuard: B07PDB1KK9 For municipal water, KDF 55 MediaGuard removes chlorine and heavy metals. For our KDF 85 MediaGuard: B07PJN729V For Well Water, add the KDF-85 MediaGuard to remove moderate amounts of iron and hydrogen sulfide (up to 1 ppm iron and/or H2S).