Why would you want a rainbow??? I did some research on this sweeper and found that it is high in emission, has a high mold count, and is just dangerous. This thing is banned in four countries. Every test I have found places rainbow last it it even places it at all. Even rainbow added a hepa filter because their own water filter was not getting everything. Even with that extra filter you still have high emissions and it doesn't filter down to the level that Filter Queen does. With Filter Queen you filter the air with or without the attachment pieces. My bet will always be with Filter Queen