Key Features Three Month Service Pack for the Interpet Internal Aquarium Filter CF3 It is recommended that you change the filter and Algaway pad in the CF1 filter, every month. Changing the filter pads ensures your aquariums stays clear, clean and algae free. Carry out a 25% water change, using a Tapsafe treatment to treat the water. Remove and discard the old filters and slip the new filters easily into place.
