Ewbank® Raycop Antibacterial Bed Vac 3 "How can you tell if it works?" Julia 15 August 2011 I bought this to help my daughter who is highly allergic to house dust mite. It does vibrate and light up and there is visible evidence of something being sucked into the box - but how can you tell if it is eliminating the house dust mite? There is nothing other than the degree of scratching that indicates its effectiveness. I so want to believe in this product but could do with some kind of confirmation that it is working - particularly as I purchased mine on 27th July and see today that it has reduced by nearly £17.00!!! Very easy to handle though. A note from the team Given the seal of approval by the British Allergy Foundation, the Raycop Vac works in three unique ways: the vac shines a UV-C sterilising lamp which kills 99.9% of bacteria a vibrating pad releases millions of dust mites from the bed, to enable deep-down cleaning two-stage micro allergy filtration safely and efficiently removes dust mites and their allergens.