Lightweight, durable, and easy-to-cut biological media for pond filtersVarying densities transition from mechanical to biological filtrationBiological filter media creates ideal nitrifying bacterial conditionsLightweight, flexible filter media creates ideal conditions for nitrifying bacteria. Unique media structure traps debris and provides super high surface area for beneficial bacteria. Resists clogging or channeling to maintain highly oxygenated water flow. The result is healthy pond water conditions. Use individually or transition varying densities for optimum biological filtration. 24" x 39" x 1-1/2" thick. Please click on "More Information" for filter density chart.

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