PowerFlo 1000 Biological Media 6 3/4 lb PT565

Because of its large porous surface area, Laguna Lava Rock is the ideal host for large populations of beneficial bacteria. 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.