Article 12
For the purposes of Article 4, Member States shall ensure that treatment chemicals and filter media that come into contact with water intended for human consumption do not: directly or indirectly compromise the protection of human health as provided for by this Directive; adversely affect the colour, odour or taste of the water; unintentionally enhance microbial growth; contaminate the water at levels that are higher than necessary in view of the intended purpose. For the national implementation of the requirements of this Article, Article 4(2) shall apply accordingly. 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.