I actually tried this once with my 33 gal and my 15 gal and it didn't seem to be working well (not "better" than just using the 33 gal by itself). But it's highly possible that I didn't know what I was doing. LOL. I had looked at some videos and tried running lines from both outputs into a T and then a single hose from that to the sprinkler blowout connector. Maybe next year I'll try it again and see if I can figure it out.