Originally Posted by
Ghs57
On my 2x6 hybrid pan, I start to shut down when I have about 20 gallons left. My rig runs at about 35 gallons an hour. This usually works out well, with the head tank empty and a lower pan level than I normally run at. Next run will bring the pan back up to my operating level. This is not an exact science though, and takes some practice to zero in. You really have to know your rig and its boiling rate, cool down time, etc. I have doubled my RO capacity this year, so there may be some variation.