| http://www.w3.org/ns/prov#value | - Accordingly, the present invention provides moving means, such as a screw shaft, etc., which is actuated during the light irradiation treatment of the liquid so that supporting bodies are caused to move, thus causing cleaning parts (scrapers or the like) attached to said supporting bodies to slide along the outside surfaces of the respective light-transmitting tubes of each light irradiating modul
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