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Part number: 21539
but for smaller aquariums where the Professional 3 is too large
Measurements: 98
Varies slightly depending on porosity
MarinePure Bio Filter Block - 8x8x4" Dispatch_3 - 6 Weeks Part number: 21539MarinePure has literally changed the way your tank can be run. The massive surface area, and huge potential for biological filtration has removed the need to design tanks around live rock. MarinePure has been so successful in handling the biological filtration that you can now run an entire tank without any live rock at all. This opens up many new design possibilities, especially when using ceramic structures which traditionally have been poor at