Filters, including the 1020 Aquarium Power Filter, are a very important piece of equipment in an aquarium and critical to your aquariums success. The job of the fish aquarium filter is to move the water through the filter cartridge where it is processed to remove odors and small particles of waste and through the BIOFiber to eliminate the toxic ammonia and nitrites from the aquarium water. The AquaTech Power Filter provides this 3stage filtration for healthier fish and cleaner water. The first stage of the AQUATechÂ filtration is mechanical. The blue polyfiber pad that is integrated onto the EZChangeTM Filter Cartridge screens out dirt and debris as water passes through. The second stage of the AQUATechÂ filtration is chemical. The activated carbon that is in the EZChangeTM Filter Cartridge removes dissolved waste and cleans the water of odors. The third stage of the AQUATechÂ filtration is biological. The BIOFiber that is included in each AQUATechÂ Power The AquaTech Power Filter provides additional surface area for beneficial bacteria to grow and thrive. The bacteria then eliminate toxic ammonia and nitrites that can be fatal to fish. You should never clean or throw away the BIOFiber. If the BIOFiber becomes too clogged, rinse it with conditioned water only.