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3. Coloration (after filtration) mg Pt/l A discharge affecting shellfish waters must not cause the colour of the waters after filtration to deviate by more than 10 mg Pt/l from the colour of waters not so affected Filter through a 0·45 µm membrane Photometric method, using the platinum/cobalt scale Quarterly

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Source: EUR-Lex (Cellar) · retrieved 2026-10-22 · Text as adopted (Official Journal); later amendments are not incorporated in this text.