A cooled storing system for photo catalytic decomposition of ethylene is a reefer container or a refrigerator with a cooling unit including an evaporator, the surface of which is at least partly coated in TiO2. A UV-source is arranged so that light emitted therefrom falls on the surface provided with TiO2, whereby an active surface for photo catalysis is provided. When in use, an airflow created inside the system passes over the photocatalytic surface permitting decomposition of organic compounds such as ethylene present therein.
