- Lake Mälaren has a long history with problems concerning algal blooms and eutrophication. There are just over three million people living around Lake Mälaren and they are using it for swimming and recreation. It is also the lake we take most drinking water from and it is also a problem for the water treatment plant with algal blooms, says Ingrid Hägermark at the Lake Mälaren's Society for Water Conservation.

Read the article and watch the interview/demonstration (in Swedish)
Satelliter varnar om algblomning i Mälaren

Figure: In the movie clip Ingrid Hägermark at the Lake Mälaren's Society for Water Conservation explains how the service works. Photo: SVT.