IDEA: emergency pump for small volumes

Hi,
  the washing machine waste filter got clogged up with what turns out later to be a lolipop stick. In order for the filter to be accessible there was the need to pump out all the water. Usually, I have a little tray which I fill time and time again to empty the machine.

  However, tired of dumping and spilling most of the water in the process I was thinking about how to create a water pump. The design ended up to be very simple in the end. A 2 liter water bottle with smooth sides got cut in half at the diameter half way up the bottle. The two halves could be pushed into each other with a thin cut of the bottom half to make it slightly smaller in diameter.

  Using tape and a sturdy plastic sheet I sealed the bottle as to allow the parts to slide into each other easily. On pulling the bottom part out create a small vaccum that is forced to be filled through the lid as the plastic sheet sticks to the gap and prevents air to enter at the cut seam.

  The design allows around 800ml of water to be sucked up before the water needs to be expelled by unscrewing the cap and letting the water out. Also, at this time pushing the bottom back into the top to "reload" the bottle so to speak. Repeat this process until all the water that can be extracted has gone. Then it was a minor spillage to get to the filter and remove the blockage.

  I fitted the cap with a thin piece of hose so that I do not have to hold the bottle into the water directly. Also, if the machine is still quite full gravity will help letting the water out. Simply submerge the whole of the hose into water to get all the air out. Then put one end into the machine water and hold the other end near the floor into a bucket of even drain if there is one. The water will then flow down until the hose sucks in air or the water level is too low.