Laguna PowerFlo 1000 Biological Filter Media, 6.6-Pound

This lava rock is the ideal host for large populations of beneficial bacteria. Large porous surface area. Placed in the appropriate pond filter media chamber. The lava rock encourages the growth of friendly bacteria, which are essential for biologically filtering out harmful toxins and creating optimal conditions for clean and clear pond water. The filter media is suitable for most underwater and external pond filters. This product weighs 6.6-pound.