There are several risks in fresh water and swallowing the water is only one route of infection.
You can get infections directly into your lungs by inhaling the tiny dropletts that may be in your air if your regulator breathes wet.
In fresh water the major hazards are critters too small to see. In the ocean the worst hazards are big enough to see with the eye.
You can get infections directly into your lungs by inhaling the tiny dropletts that may be in your air if your regulator breathes wet.
In fresh water the major hazards are critters too small to see. In the ocean the worst hazards are big enough to see with the eye.