Please note this product might take a little longer to arrive as it may be shipped from outside the uk. The energy efficient and extra quiet pump switches off automatically when the water level is too low. Catit pixi replacement pump at a glance alarm automatic shut off sensor in the pump ensures that it automatically shuts off when the water level is too low very quiet, energy efficient pump durable ceramic bearing ensures smooth, quiet operation suitable for catit pixi drinking fountain models in white, blue,stainless steel and pink. Cleaning the pump if you suspect the pump is dirty, open the pump and remove the impeller cover and impeller. Remove any dirt from the impeller and clean the impeller shaft with running water. Be careful when handling the impeller. If the pump causes noise, clean the pump as described above and fill the drinking water reservoir with plenty of water so that the pump is completely submerged. The pump must not run dry!