Wet Dust Can't Fly® The Rainbow uses Mother Nature's most powerful element, water, to trap dirt and odors, returning only naturally clean, water-washed air to your home environment. Twice as clean This unique water filtration system captures 99.997% (by weight) of typical household dirt. Remaining microscopic particles are caught by our HEPA Neutralizer Filtration System. This two-stage filtration combination removes nearly 100% of dirt and contaminants. The Rainbow is certified asthma & allergy friendly™ by the Asthma and Allergy Foundation of America. Buyer Beware Do not make the mistake of purchasing your Rainbow from an unauthorized retailer. Only an Authorized Rainbow Distributor/Dealer can sell and support an authentic Rainbow.