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This is a 6 ounce pack of Fluval BioMax Media (A495) for the Fluval U2 Aquarium Filter, Fluval U3 Aquarium Filter System, and Fluval U4 Aquarium Filter System. The Fluval BioMax filter media is used as the Stage 3 biological filter media in all of the above listed Fluval U Series Underwater aquarium filter units.
Fluval BioMax aquarium filter media for the Fluval U2, Fluval U3, and Fluval U4 aquarium filter systems is enriched with oxygen to provide an optimum biological balance in your aquarium, allowing beneficial bacteria to flourish which helps maintain a healthy aquarium environment. Fluval BioMax filter media also quickly enhances the reduction of toxic ammonia and nitrite to help your aquatic pets thrive better.
About half of your Fluval Bio-Max media should be replaced approximately every 6 months - it is not recommended that you replace all of the Bio Max filter media at one time because to do so would upset the balance of beneficial bacteria in your aquarium.
This pack of Fluval Bio Max biological media is also known by Hagen part number A-495. It can be used in both freshwater and marine aquariums.