3.
Pursuant to paragraph 1 of this Article, and without prejudice to Regulation (EU) No 528/2012 and by using relevant European standards for specific treatment chemicals or filter media, Member States shall ensure that the purity of treatment chemicals and filter media is assessed and the quality of such chemicals and filter media is guaranteed.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-28 · Text as adopted (Official Journal); later amendments are not incorporated in this text.