Liquid treatment apparatus has a radiation emitter with a transparent window that is cleaned by a sliding and rotating cleaner

摘要

A liquid treatment apparatus 10 having a housing 11 with a liquid inlet 12, a liquid outlet 13, and a passageway 14 connecting the inlet and outlet and through which liquid can flow. A radiation emitter 15 has a radiation transparent window 18 to allow radiation to pass into and treat the liquid passing through the passageway. A cleaning device 16, 17 in the passageway moves along and cleans at least part of the window at periodic intervals. The cleaning device is moved by the flow of liquid passing through the passageway.