Article 5
1. Without prejudice to the provisions of Article 4(1)(b) of Directive 80/777/EEC, application of the treatment of natural mineral waters with ozone-enriched air must be notified in advance to the competent authorities, who shall ensure that: (a) use of such treatment is justified by the composition of the water in terms of compounds of iron, manganese, sulphur and arsenic; (b) the operator takes all measures necessary to guarantee that the treatment is effective and safe and to allow it to be checked by the competent authorities. 2. Ozone-enriched air treatment of natural mineral waters must comply with all the following conditions: (a) the physico-chemical composition of the natural mineral waters in terms of essential constituents shall not be modified by the treatment; (b) the natural mineral water before treatment must comply with the microbiological criteria laid down in Article 5(1) and (2) of Directive 80/777/EEC; (c) the treatment shall not lead to the formation of residues with a concentration exceeding the maximum limits laid down in Annex III or residues which could pose a risk to public health.