DYMAX Slim Flo Filter CartridgeDYMAX Slim Flo replacement filter cartridges work to keep aquarium water clean and clear. Combine mechanical and chemical filtration, each cartridge is able to filter and trap particles, waste, as well as to remove odour and colouration, so as to provide good water quality and clarity. Instructions: Turn off power supply and remove plug from socket. Remove the filter cover from the unit. Slide up the used filter cartridge slowly from the filter