On a note of convenience...I can even do a 50 gallon water change using my Apex app on my iPhone and I don't have to get off the couch
Pumps old salt water out directly to a drain, open and close a few solenoid valves, pumps new salt water from mixing station back to the display.
No pails, hoses, or towels! It was worth the set-up costs. One day later when the RO/DI refills the barrel I pour salt mix in and I'm ready for another.