42×72 resin tank 50×60 brine tank 30 cubic feet of high capacity resin 250 lbs 1/4×1/8 gravel support bed 450 lbs 1/2×1/4 gravel support bed 85/120 gpm min/max service flow rate 50 gpm backwash flow rate Space Required 96x50x96 (LxWxH)