Complete water softener system includes 3/4 cu.ft. of resins per tank ( 8" x 44" ).
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 / Installation Manual
You will need to add resins to tanks ( recommend using a funnel ), then attach valve, and piping connections.