The Mag-Float Scrape Large Plus+ Glass Aquarium Cleaner features the same patented technology found in the original Mag-Float series, with the addition of a perfectly angled stainless steel scraper blade (for extra stubborn algae build-up). This unique tool removes algae from your aquarium without getting your hands wet. This super-convenient floating cleaner polishes aquarium surfaces and floats when the inner magnet separates from the outer magnet. Because you never have to reach into the aquarium, you can not only stay clean and dry, but you can also avoid introducing toxic soap or lotion residue from your hands into your aquarium. The Mag-Float Scrape’s powerful rare earth neodymium magnets provide lifetime durability and ample strength to get the job done. Simply move the outside magnet, and the inside abrasive Hook-and-Loop magnet scrubber follows; cleaning as it goes! If the magnets separate, the inner magnet floats right to the water’s surface for easy retrieval. The Mag-Float Scrape can be used with or without the detachable stainless steel scraper. Great for both freshwater and saltwater aquariums. Designed for use on 3/4″ glass surfaces. Includes 1 stainless steel scraper. NOTE: do not use this product on acrylic aquariums, as it will scratch the surface.