I collect all the waste water in extra containers and try to find other uses for it. Garden in summer, toilet in winter. It's a bit of a pain, but helps keep the actual waste to a minimum and also helps with the quarterly water bill from the city.

well keep an eye out for your Zero Waste RO/DI units!

Thanks BWI, but if I understand correctly, the zero waste system you're offering puts the waste water into your hot water line? I don't think this will work on a hot water system using a tankless hot water heater. This is something I'm planning on installing in the near future.

your water heating source doesn't matter what so ever

Will do. I actually purchased my SR-1 RODI system from you folks this past April.