Complete water softener system includes 1.0 cu.ft. of resins per 9" x 48" tank ( 2.0 cu ft total ).
Fleck 9100 Econominder twin alternating control valve with cover.
3/4" or 1" stainless steel By pass( you select ) and Brine Tank ( Round with safety float pickup, unless you request "square" brine tank). Service Manual
You will need to add resins to tanks with funnel provided, then attach valve, and piping connections.