This is not an original idea, its been done before, but I have never seen a decent how to really, so figured id post some pics in case anyone else wants to do something similar. $4.96 "baby bubbles" battery operated pump from walmart. ~$1.50 ebay float switch, either a right angle one: http://www.ebay.com/itm/390961328520?_trksid=p2059210.m2749.l2649&ssPageName=STRK:MEBIDX:IT Or a straight one: http://www.ebay.com/itm/261676922012?_trksid=p2059210.m2749.l2649&ssPageName=STRK:MEBIDX:IT I got a pair of them, run in series, so that the pump wont run unless they are both down. I figured a little redundancy wouldnt hurt. Sealed gallon jug with 2 fishtank airline tubes going into the lid. One should go all the way to the bottom, the other just inside the lid. Either drill holes carefully so the tubes seal, or slap a little silicone around the holes if you are sloppy. Trial to make sure everything works, I will use a 3v transformer instead of batteries, yet another reason I save all of my transformers for any electronics that I toss, but batteries should be fine for a long time: I will post the rest later.