“You can qualify with nasty bacteria or algae. In most cases it concerns E-coli, the feces bacteria, or blue-green algae. You can get stomach and intestinal problems, fever and diarrhea from both. Not serious, but very bad “It’s annoying if you get that from an afternoon of swimming. Besides that, you don’t know if there are bicycles or other sharp objects on the bottom, for example, where you can injure yourself dangerously.”
Safe swimming in natural water: you need to know this
