1. For the purposes of Article 4, Member States shall ensure that materials that are intended to be used in new installations or, in the case of repair works or reconstruction, in existing installations for the abstraction, treatment, storage or distribution of water intended for human consumption and that come into contact with such water do not:
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(a)
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directly or indirectly compromise the protection of human health as provided for by this Directive;
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(b)
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adversely affect the colour, odour or taste of the water;
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(c)
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enhance microbial growth;
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(d)
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leach contaminants into the water at levels that are higher than necessary in view of the intended purpose of the material.
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