I have mine set up to a 35 gal
barrel, I come out of the RO
unit and I have a shut off just before the barrel. From there I have a T splitter one end goes into the barrel float shutoff near the top of the barrel and the other goes to my homemade stand alone shutoff in my sump. It works great, Always keeps my barrel full of fresh RO
water and keeps my tank full from evaporation. When I am ready to do a water change I shut off the water from the RO
, mix the salt in the barrel and do the change the next day, When done I turn the RO
water back on and it all fills back up again. I did it this way because I didn't want to put a whole in the bottom of my barrel and I didn't want to put a whole in my sump tank for a normal float shutoff. Unfortunately the barrel shutoff I couldn't find one anywhere, I got it from the LFS
back room. He used them in the store for their barrels Not for sale in the store. He gave it to me for a cash deal. No name on it though.