The white foam in your PF filter performs 2 essential tasks that ensure optimum water quality. Mechanical filtration - This is the term used to describe the removal of particulate waste ( such as uneaten food, plant matter) from the aquarium. Biological filtration - In your PF internal filter, the same foam acts as a media for essential benefical bacteria to inhabit. These bacteria break down toxic ammonia and nitrite, caused by fish waste , uneaten food, decaying plant and alage matter. We stock Filter foam and carbon foam for the entire range of Interpet PF Internal Power Filters. Power Filter Mini Plain Foam Pkt of 3 Order Code: INT018 Carbon Foam Pkt of 4 Order Code: INT019 Power Filter 1 Plain Foam Pkt of 3 Order Code: INT020 Carbon Foam Pkt of 4 Order Code: INT021 Super-fine filter Pads Pkt of 5 Order Code: INT022 Power Filter 2 Plain Foam Pkt of 3 Order Code: INT023 Carbon Foam Pkt of 4 Order Code: INT024 Super-fine filter Pads Pkt of 5 Order Code: INT025 Power Filter 3 Plain Foam Pkt of 3 Order Code: INT026 Carbon Foam Pkt of 4 Order Code: INT027 Super-fine filter Pads Pkt of 5 Order Code: INT028 Power Filter 4 Plain Foam Pkt of 3 Order Code: INT029 Carbon Foam Pkt of 4 Order Code: INT030 Super-fine filter Pads Pkt of 5 Order Code: INT031
