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Only ‘clean seawater’ should be used in the depuration system. Cefas has issued advice on water quality in terms of turbidity and microbiology. The seawater used should carry no risk of contaminating the shellfish (including the risk from ‘harmful substances’ or toxic marine plankton). Further advice on issues relating to the statutory requirements for clean seawater and purification system operation is available by contacting Cefas. Technical advice relating to purification system design is available from Seafish.