OASE’s BioMaster external aquarium filter collection boasts an EasyClean pre-filter module to reduce maintenance and increase filter efficiency and extend the life of the main filter foam. The BioMaster allows for a high level of customization of filter foams to meet the unique needs of a variety of aquariums. The advanced sealed filtration pathways ensure all water is filtered through all four stages of filtration, providing optimal filtration and clearer water. The Hel-X BioMedia colonizes beneficial bacteria in suspended floating modules for premium biological filtration. The BioMaster series includes a variety of sizes for both freshwater and marine applications.