When doing a water change, (TURN OFF THE WATER SUPPLY AND UNPLUG FILTER) remove the hoses from the top of the filter by flipping the switch, and insert it into a bucket. once removed, stick the entire part in the bucket and unscrew the hose going back to the tank. water will come out at first but will subside. next, put the hose of your python/water changer in place of the intake hose and insert it back into the filter. plug in the filter and turn on water supply and boom. you have a pump without buying a pump.