Rainbow Vacuum Cleaner Filtration System: Relies on water as the main filter. Dust passes into a water basin instead of a dust bag, and cleaner air is expelled. Operating Speed: Two speeds, low and high. Sucks up dry and wet debris. Features: Very high suction power. Excellent for those with dust allergies because dirt remains inside the water. Does not require dust bags. Very long lifespan if well-maintained. Disadvantages: Heavy compared to modern vacuums. Water must be filled before use and emptied after finishing. Relatively large size.