Thanks to its unique ceramic structure Bio-Max promotes protects and encourages beneficial bacteria in pond water resulting in a clean clear pond. Bio-Max has a large surface area and number of pores perfectly sized to allow beneficial bacterial colonies to thrive creating a bacterial sanctuary that maintains a biological balance in pond water. Beneficial bacteria living in the micro-tunnels and micro-cavities naturally eliminate ammonia and nitrite which are toxic compounds that originate from pond inhabitants decomposing organic matter and runoff from surrounding terrain. Item / Quantity 20560. Laguna BioMax Media 12.3 oz. (MPN PT560) / 12.3oz.