Rexair Rainbow is a brand of vacuum cleaners that uses a water filtration system to clean the air. The company was founded in 1936 and is headquartered in Troy, Michigan.

Rainbow vacuums use a unique cleaning system that involves passing dirty air through water, which traps dust, dirt, and other particles. The water filtration system not only cleans the air, but also eliminates odors and leaves the air smelling fresh and clean.

Rainbow vacuums are designed to be versatile and can be used on a variety of surfaces, including carpets, hardwood floors, and upholstery. They also come with a range of attachments and accessories, such as crevice tools, upholstery brushes, and dusting brushes, to make cleaning easier and more effective.