“This Rainbow is a marvelous machine. It has removed dirt and debris that has been left by our central vacuum. I like the water system that purifies the air while vacuuming. As a bonus, it can continue purifying all day long. I did some research on radon gas and found it is water-soluble. Although, I don’t believe the rainbow was designed to deal with radon. It can’t hurt. Again very happy with my Rainbow.”