Lime can be used in lakes for metals, although it will  change the pH which high harm the fish. Iron oxide and alumina  have been used for lake contamination to precipitate metals but they can also have major effects on fish.

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Lime can be used in lakes for metals, although it will  change the pH which high harm the fish. Iron oxide and alumina  have been used for lake contamination to precipitate metals but they can also have major effects on fish.