Product DescriptionThe Fluval C4 Activated Carbon Replacement Media, 3-pack, is capable of adsorbing most liquefied impurities and dyes present in aquarium water. The carbon works to remove odors and discoloration from your tank. Fluval C4 Activated Carbon is suitable for freshwater or marine aquariums, but was exclusively designed for the Fluval C4 Power Filter.Amazon.comFluval Carbon - 3-PackThe Fluval C Activated Carbon Replacement Media, 3-pack, is capable of adsorbing most liquefied impurities and dyes present in aquarium water. The carbon works to remove odors and discoloration from your tank. Fluval C Activated Carbon is suitable for freshwater or marine aquariums, but was exclusively designed for the Fluval C Power Filter. Fluval C Series Power FilterMaximum Versatility and Premium PerformanceEngineered to create superior water quality, the Fluval C Power Filter provides extensive 5-stage filtration for outstanding results. The Power Filter is designed to provide maximum surface area and optimum dwell times in all stages of the filtration process.New 5 Stage Filtration SystemStage 1 & 2: Mechanical- Poly/Foam Pad Effective mechanical filtration is essential for efficient chemical and biological filtration. The large surface area of the Poly/Foam pad effectively performs two stages of Mechanical filtration. The first stage of porous foam traps large particles and the second stage of dense polyester captures fine debris.Stage 3: Chemical- Activated Carbon Insert The Fluval Activated Carbon Filter Insert contains 100% premium research grade carbon, which provides large amounts of surface area for adsorption of undesirable impurities. The activated carbon filter insert removes unwanted odors, discoloration and impurities, resulting in a crystal clear aquarium.Stage 4: Biological-Bio-Screen An additional hydraulic circuit conveys part of the intake water to the Bio-Screen placed at the top of the Trickle Chamber cover. Fluval?s Bio-Screen removes any debris before dripping into the biological chamber. It also ensures that the water pumped to the Trickle Chamber is evenly spread through all areas before it drips on the C-Nodes, which are contained in the chamber. The motion of water dropping slowly through the grids mimics the rain.Stage 5: Biological- C-Nodes The surface of the C-Nodes is made up of a complex pore system that provides optimal living space for beneficial bacteria to thrive and enhance the removal of ammonia and nitrites. The new ?Star Shape? provides a higher filtration surface and more biological power than a traditional cartridge, resulting in a healthy aquarium environment.Patented Refiltration SystemSometimes delicate fish and plants require a more gentle water flow. Fluvals? patented re-filtration system allows you to control the flow rate without compromising filtration efficiency. When the flow rate is reduced, up to 50% of the water within the filter chamber is re-processed multiple times. More impurities are filtered out, creating a healthier tank with sparkling clean and clear waterWhat?s In The Box?1. Filter Cover 2. Filter Case 3. Leveling Device 4. C-Nodes 5. ?U? Tube 6. Telescopic Intake Tube 7. Bio-Screen 8. Mechanical Frame 9. Chemical Basket 10. Impeller Cover Assembly 11. Impeller 12. Biological Trickle Chamber with Cover 13. Poly/Foam Pad 14. Activated Carbon 15. Motor Unit with Seal RingMedia and AccessoriesMedia ReplacementFluval Poly/Foam: Replace poly/foam every 4-6 weeks.Biological C-Nodes: Replace half the quantity every 6 months. Never replace all c-nodes at once.Activated Carbon Insert: Replace Activated Carbon every 2-4 weeks.Bio-Screen: Replace Bio Screen every 2-3 months.Motor O-Ring: Replace once a year to prevent leaking.Power Filter MaintenanceFor optimal performance it is recommended to clean the impeller cover assembly once a year. The motor should be thoroughly cleaned every three months. Always unplug the Fluval C Power Filter p