Morton&reg; System Saver&reg; 30,000 Grain Water Softener MSD30D 30,000 grain capacity Electronic "look-ahead" technology monitors and predicts your water usage to regnerate only when needed, using 50% less salt than other units Compact design fits in 1.3 sq. ft. floor space 8 hour power interruption protection Immediate regeneration button Deluxe single disk rotary valve Easy installation kit is provided and connects to 3/4" copper plumbing