As you move the outside magnet, the inside magnet brush follows to clean the glass. The floating inside brush will not sink into the bottom of the tank.
• super strong magnets are for use with varying glass thicknesses
• floating brush avoiding lost magnets on the bottom of your aquarium
• anti scratch cleaning pads that are highly efficient in removing algae from glass
• Rough surface to clean algae and dirt inside, soft smooth surface to clean outside
• non slip griped handle improving cleaning action
• Good for both fresh water and salt water