The pond is a man-made ecosystem and a habitat for many animals, plants, algae and microorganisms. In order to maintain a water system similar to one in nature, the garden pond must be kept artificially stable. In general, the larger the pond, the better its self-cleaning ability. Pond pumps ensure full circulation in the water and should not be absent from any pond. In addition to pond size, the area of application is crucial in selecting the right pump. Here, a distinction is made between pond filter pumps, oxygen pumps, stream and fountain pumps.