Biological pools, like natural lakes in nature, are aquatic ecosystems colonized by living beings. Organisms that live in the surface part of the water, scientifically called pelagial, swim, float or float permanently in the water. The characteristic pelagial community moves in a floating form and is called plankton, composed of species of phytoplankton or zooplankton. Phytoplankton are microalgae, zooplankton are microanimals. The later, already equipped with “antenna”-type organs with which they can move through the water, perform very important functions in biological pools.
Zooplankton feed on phytoplankton, that is, microscopic-sized algae. If they establish large colonies, they can cause cloudy water. The presence of zooplankton in a biological pool is therefore beneficial, because these living beings are very effective in self-purifying water. They work tirelessly on grazing, removing and reducing microalgae from the water. The large number of individuals compensates for the size of these animals, so much so that the water is completely transparent and clear.
In this context, the presence of macrophyte plants for water oxygenation is important, because zooplankton need well-oxygenated water to develop and establish large colonies to control microalgae. Up to 600,000 individuals can live in a cubic meter of water, invisible to the naked eye and completely harmless to human health. Zooplankton can move freely in a biological pool and occupy all available space. Thus, microanimals are present not only in the plant area, they are also very active in the bathing area. It can be perceived as a living but invisible filter that keeps the water transparent, a more than welcome effect for maintaining the quality of bathing water.

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