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Replace foam inserts at least monthly depending on your aquarium set-up or application. The Fluval 1 Plus Foam Pads have been specially developed as a standard filter medium for the Fluval 1 Plus submersible filter. The foam design maximizes surface contact between the water and the media. The large filtering surface ensures efficient cleaning of the aquarium water and maximizes the colonization of beneficial bacteria. Instructions: Replace foam inserts at least monthly depending on your aquarium set-up or application. Contents: 2 pieces