00:00The content of iron in natural reservoir
00:05In rivers and lakes, the iron content varies from 1 per 10 to 1 mg per litre of water,
00:13and sometimes even up to 100 mg per litre.
00:19In winter, in summer, the concentration increases. In spring and autumn, it decreases.
00:25Maximum permissible concentration for aquatic environment is 0.3 mg per litre
00:32and for fishery pounds 0.10 mg per litre.
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