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A 50mm mesh filter which screws onto the cod end of a plankton net. This overcomes the problems of organisms depositing on the net when bottles or rubber funnels are used. Organisms caught by the net are deposited on a mesh screen of the same material as the net itself. This can be unscrewed in the field and either washed off into a container for immediate re-use or dropped into a bottle for future examination. Regular washing in fresh, clean water is recommended to ensure the longevity of the filter.