My RO/DI unit and reservoirs are in a separate room since I don't really need to access them directly. I didn't want them taking up fishroom space. The water changes are handled by the profilux. The manual labour in my system involves turning a ball valve to empty new RODI water into the lower NSW reservoir. Then I open the lid and dump a predetermined amount of salt in and the next day the water change system gets right back at it.
So I have to make NSW. But I don't have to manually remove OSW from the tank or add NSW to the tank. That's all handled by the robots
