Water evaporation is not pollution at all. All living beings are evaporating water, plants, animals and people. Water evaporating on a lake surface is a process that has existed as long as there has been water open to the sky in the World.
Evaporate means to reduce a liquid state to vapor. In the case of water, you need contact with a colder environment, for example the air above the water of a biological pool. In these circumstances, parts of the water, which enter into gaseous form, condense again into fine droplets. Water vapor then consists of these droplets and gaseous water, which is invisible. This mixture is called wet vapor, which is visible.
The environment surrounding the biological pool takes advantage of this extra dose of water, especially above the plant foliage we can see how this extra water is used. Spider webs become visible with this humidity, which places the water droplets like pearls on a necklace. Insects look for the drops placed on the leaves, then condensed, to quench their thirst and the plants themselves are grateful for the washing of the stomata, microscopic openings in the leaves which allow the plants to breathe and transpiration.
Because, in a biological pool, water is reduced by evaporation, a completely natural phenomenon. This causes the need to replenish water in the biological pool during the summer months. But this should not be considered a loss, it is an asset for life around the biological pool.