The municipality writes on its website that it has set up information at the relevant bathing sites and that it primarily advises children and animals not to swim at these.
This is because they can easily absorb the water and are also extra sensitive.
Algae blooms can cause skin irritation and if you ingest the water it can cause itching, vomiting and diarrhea.
Cooking does not help
The municipality also advises against using the water as drinking water or for cooking, as boiling does not destroy the toxins.
Algae blooms are characterized by blue-green or brown discolorations of plankton in the water.