This revolutionary magnetic aquarium cleaner has a unique property that makes the magnet on the inside of the aquarium glass float when the two pieces are separated. Its buoyancy makes it easy to operate and guide around corners without sinking. The cleaning brush stays free of sand or gravel, preventing scratching and the strong attracting magnets easily remove algae. Mag Float magnetic cleaners are made with a high quality cleaning material and felt, along with a rustproof high grade ABS casing.