- Extremely porous filtration medium for biofiltration designed to be used in all aquariums and aquatic systems with a pH of 7.5 or higher.
- One brick provides around 100,000 sq. ft of surface area for bacterial colonization.
- Doped with sulfur particles for the cultivation of large amounts of anaerobic microbes to provide for a large denitrification capacity.
- 9x4.5x2.5" Brick.
- Made in the USA.
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