LOCH Leven in Perthshire was once known for the algal blooms that blighted it due to pollution.
It got so badly choked with slimy algae one weekend in June, 1992, that the event became known as Scum Saturday, causing a major alert and leading to questions in parliament.
Now, however, the loch's water quality is the best it has been in more than 20 years, according to a report commissioned by Scottish Natural Heritage.
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