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Lava Filter Rocks (red) Lava Rock Filter System - 3 Gal.
Lava Rock
Fairly lightweight, very porous, lots of crevasses
Excellent surface area for beneficial bacteria to colonize
Very inexpensive and easy to maintain

Perfect For Preforms And Smaller Liner Pond Up To 300 Gallons
Lava rock is fairly lightweight, very porous, lots of crevasses
Excellent surface area for beneficial bacteria to colonize
Very inexpensive, easy to clean and maintain