Rainbow cleaning system is the only certified air cleaning system on the market. It uses water to trap dust,dirt, and pollen in its unique water basin. Wet Dust Can't Fly! it has 100% airflow at all times un like traditional vacuums that loose 85% airflow within the first 15 min. of putting a new filter or bag on. It is great for people with allergies and breathing problems. It is also great for people who have pets. We give free in home demonstrations with no obligation to purchase.