The water quality is negatively affected by phosphorus and nitrogen compounds as well as organic pollutants.
Algae, suspended organic matter and pathogenic germs are the effects, which pose a high health risk for humans and animals.
Plants and natural microorganisms cannot adequately provide the necessary natural cleaning performance. Microorganisms die off.
Harmful substances are caused by decomposition processes in the water, are carried in as dust and animal excreta via the water surface, but also via the refill water – also from the water pipe or via the roof surface water.