Product DescriptionAquaClear 20 BioMax is replacement filter media for the AquaClear 20 Power Filter. AquaClear 20 BioMax provides an optimal environment for the colonization and growth of beneficial bacteria, which is essential for effective biological filtration and water purification. BioMax?s complex bio-ring pore structure allows beneficial, toxin-reducing bacteria to thrive. By reducing toxins such as ammonia and nitrite, BioMax effectively increases biological filtration efficiency by 30%. BioMax comes in a mesh bag for quick and easy installation. Exclusively designed for the AquaClear 20 Power Filter, BioMax is suitable for fresh and saltwater aquariums. AquaClear creates a wide variety of products for freshwater tanks such as fish tank accessories, fish tank decorations, and aquarium filter media that is perfect for large and small fish tanks.Amazon.comAquaClear Power FilterThe AquaClear Power Filter represents one of the most versatile hang-on filter systems available. The five models available provide a complete selection of flow rates for the most popular sizes of aquariums. The filter?s unique design allows for up to six times more media volume and the longest water to media contact time in the industry.Superior Contact with AquaClear FilterPatented Re-filtration System Sometimes delicate fish and plants require a more gentle water flow. The patented AquaClear 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 processed multiple times.CycleGuard Multi-Stage Filtration SystemProvides optimal mechanical, chemical, and biological filtration. A healthy aquarium requires "beneficial" bacteria. Invisible and harmless, beneficial bacteria are essential in the removal of toxic ammonia and nitrite. With cartridge filtration systems, when you throw away the cartridge, you throw away beneficial bacteria. It can take weeks for the bacteria to re-colonize, resulting in a stressful environment.Typical Filter Media Placement:BottomAquaClear Foam Insert, which does the following: 1. Helps with debris removal and provides optimal water distribution patterns, allowing subsequent filter media to perform at full efficiency. 2. Biological filtration, due to the porous structure of foam, providing surfaces for beneficial bacteria.MiddleAquaClear Activated Carbon Filter Inserts contain 100% premium research grade carbon. Premium research grade carbon provides large amounts of surface area for adsorption of undesirable impurities.TopAquaClear BioMax Filter Inserts contain BioMax ceramic rings. The surface of BioMax is made up of a complex pore system that allows bacteria to thrive.AquaClear Power FiltersPower Filter MaintenanceFor maximum filter operation and efficiency, regular cleaning of the filter and its parts is recommended every two weeks.Always unplug the Aquaclear Power Filter prior to cleaning.First you want to remove the cover, filter basket, and discard water remaining in the filter case. Thoroughly rinse collected debris from the case, impeller cover and impeller assembly using clear lukewarm water.Then intake "U" tube and extension tube can be cleaned with a filter stem brush to remove any build-up of deposits.When all parts have been cleaned and thoroughly rinsed, reassemble filter and replace any scheduled media. Install the filter once again back on the aquarium making sure that the filter is tipped slightly forward.Then fill the AquaClear filter box with aquarium water. Finally plug the filter into an electrical outlet and the AquaClear will self-prime and begin running in a few seconds.Media ReplacementAquaClear Foam Filter Insert: Replace Foam Filter Insert every two months. AquaClear Activated Carbon Filter Insert: Replace Activated Carbon Insert every month. AquaClear BioMax Filter Insert: Replace BioMax Insert every three months.W