Just finished most of my plumbing. What I've done for this .. in my utilitiy room, which is about 10 feet from tank, I am pulling water in from my well tank, directly into my RODI system. RODI water goes into a 55 gallon drum elevated about 4 feet up. Under it, another drum, where I can drop the RODI water and make saltwater. Waste water line goes into a pipe, which goes into another drum in same room. Overflow, on RODI drum, goes into this waste water drum as well. Once drum hits 55 gallons, it drops into a small holding vessel, with a sump, and I run it outside, essentially water the garden in the summer and just dropping it in the ground in the winter. With the drum inside, I have a value on it so I can also use it for household plants, backup if we lose power I can flush toilets (on a well), fountain outside, etc.