Flat Cleaning Sponge for rapidCleaner Cleaning Sponge for Aquarium Glass Suitable for EHEIM rapidCleaner Cleans all glass surfaces Quickly and effectively removes algae and dirt from aquarium glass Sea water: Yes Fresh water: Yes Packing dimensions (width): 12.1 cm Packing dimensions (height): 24.2 cm Packing dimensions (depth): 3.6 cm