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UV anti-allergy vacuum cleaner. Raycop anti-allergy UVC vacuum cleaner on a mattress. This vacuum cleaner uses UV-C (ultraviolet C) light to sterilise the air it sucks in, killing dust mites, bacteria and other micro-organisms. It then uses specialised filters to trap these and other potential allergens and remove them from the air. (KEYSTONE/SCIENCE PHOTO LIBRARY/PUBLIC HEALTH ENGLAND/SCIENCE PHOTO LIBRARY)