Strategic Maritime Resources Spot Free Water Filters 2500 Gal. Capacity between flushes Produces an endless supply of soft, filtered water. Minimizes cleaning time, reduces plumbing repairs and prevents build up on shower stalls. Tested and proven in the International Yacht Industry. Ion exchange occurs between harness elements and the filter's media resulting in softened and filtered water. Unit is rechargeable by backflushing for approximately 5 minutes. Dimensions: 27" x 6" Weight: 23 lbs. Max Water p.s.i.: 100 p.s.i. 1 pre-filter housing with 1 carbon block filter 1 bottle hardness test strips ( 50 count) 1 set of hoses ( 2' & 4' ) 1 recharge cartridge 1 2lb. bag of recharge media 1 Spot Freer softener unit