Rainwater and biological pools constitute an ambivalent relationship. When it rains, the biological pools fill with good quality water, very pure water, almost H2O quality. Welcome rain! However, due to the purity of this water, it is not recommended to fill a biological pool entirely with rainwater alone.

Water without any mineral additives is a very good solvent and therefore poses a certain danger to living beings. For the same reason, it is not good for people to drink pure H2O water every day. Aquatic plants also need gases and minerals present in water as a source of nutrition and assimilation.

Rainwater absorbs a certain amount of carbon dioxide as it falls from the sky. Scientists believe that the more CO2 is in the atmosphere, the richer the rain will be in this gas that is harmful to the Earth’s climate. Rainwater in a biological pool provides CO2 to plants, which in turn convert this gas into oxygen-producing biomass. A very welcome effect!

A heavy rain, especially at the end of the autumn bathing season, after the last warm days, could mean such a drastic change in the aquatic environment of the biological pool that it could cause slight turbidity for one or two days. This turbidity, in the extreme and rare variant, could transform the appearance of water into a milky liquid. This effect is caused by the death of countless plankton individuals, especially rich in diatoms. These microalgae have a silica skeleton and precipitate to whiten the appearance of the water. But the phenomenon is really rare.

So, when it rains next time on a water surface, think about the good and bad effects that this could have for the ecosystem and the living beings that live in its water.

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