The chambers are ready to walk in and equipped with one or more doors or gates for loading machinery, equipment, products such as tires and other bulky goods. Inside the chamber, APR treatments can be carried out with ozone (anticavitation processing) on an intrinsically safe basis. Loading can be carried out: discretely, batch-wise, semi-continuously or continuously with appropriate curtain design. To ensure ozone safety, ozone catalysts as well as appropriate ozone sensors are used.