(11)In particular, the Commission should be empowered to adopt limits for the concentrations of constituents of natural mineral waters, any necessary provisions for the indication on the labelling of high levels of certain constituents, the conditions of use of ozone-enriched air for the treatment of natural mineral water, information on the treatments of natural mineral water, methods of analysis to determine the absence of pollution of natural mineral waters, and the sampling procedures and methods of analysis necessary for checking the microbiological characteristics of natural mineral waters. Since those measures are of general scope and are designed to amend non-essential elements of this Directive, inter alia , by supplementing it, they must be adopted in accordance with the regulatory procedure with scrutiny provided for in Article 5a of Decision 1999/468/EC.