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New research for the National Trust at Cornwall's largest freshwater lake suggests that otters are now firmly re-established in the area.
Loe Pool near Helston has suffered from algal blooms in the summer which have made it hard for plant and animal life to survive.
But in 1996 phosphate stripping was introduced at Helston sewage works.
That has reduced the algal blooms says Marlene Brunet, a biological diversity student from Plymouth University.
Her research has been welcomed by the Environment Agency and English Nature.
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