The drinking fountain should regularly get the filter replaced. Also works the same as a humidifier. Our animals, cats and ferrets drink ye all of it, it gets a bit and dabbled around sprayed, so the wells should be on a water-resistant bottom. The plastic of the housing unit to vibrate slightly. To avoid that helps a particle behind the lever and plug in the filler cap in order to interrupt the vibrations. This unit is now almost gräuschlos and hums softly in a low frequency.