New in Box Nelsen 12″ x 48″ Backwash Only Filter Unit – features include C-Series EE 1 3-cycle backwash filter valve, bypass valve, black polyglass mineral tank, basket distributor and gravel bed. Order filter media and plumbing connections separately. Holds up to 2 CF of filter media. Can be used with a brine tank for water softening application. I have a brink tank listed in another ad but it is the tank only, you would need additional parts for a complete softener with brine tank installation. Brine tank not included. Black polyglass mineral tank, basket distributor and gravel bed.