Posted 8 Months, 2 Weeks ago merrenk Expert Boarder Posts: 104   I have a 75 gal tank that I fill with an RODI. With normal evaperation, I had water to it roughly every 6 days or so. Is there something I can use to refill the tank automatically, similar to how ur toilet works? The administrator has disabled public write access. Posted 8 Months, 2 Weeks ago Scronty Expert Boarder Posts: 128   Tons, man, tons. Do a google search, here's one to get you started. The administrator has disabled public write access.