I picked up a submersible water fountain pump kit from Menards season end clearance a month or so ago. Was $50 but I got it for half price. I hook a hose to it and pump my tank water down the shower drain; in the summer I'll pump it out the window to plants/flowers. I have a metal adaptor from the hardware store to hook the hose to the bathroom faucet to refill. I started with the plastic one from a waterbed filler kit but it didn't last long.