AquaTop's FORZA 25-40 Power Filter comes equipped with all the necessary filter media to ensure superior filtration: Mechanical, Chemical & Biological. The 25-40 utilizes a filtration chamber system with replaceable filter sponge cartridges enhanced with AquaTop's Activated Carbon and Biological Media Trays with maximum surface-area for your beneficial bacteria to colonize and help keep clean water. The FORZA 25-40's innovative and flexible design is perfect to help you eradicate and control free-floating debris and harmful waste from the aquarium in both freshwater and saltwater.