Because the new salt is lighter and finer than the old salt and tends to blow around, Schroeder said, shouting over the din, the engineers were in the process of changing the size of the apertures in the salt receptacles to insure a more even flow.

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About 10 hectares of tidal salt marsh is being created by two outfall pipes which are opened to allow water to flow in and out.

BBC: Salt marsh returns to bomb site at South Efford reserve