The requirement is set out in § 4 in Danish Order No. 8 of 3. January 2023 on authorisation of disinfectants etc. in certain food establishements etc.
The application process lasts up to 5-6 months and is free of charge.
The use of the authorised substances shall be in accordance with the restrictions and specifications set out in the authorisation.
You can find information about authorised corrosion suppressants on the positive list of the Danish Veterinary and Food Administration provided on this page.
The following substances must not be used:
• Boric acid and sodim tetraborate (borax)