Atlantic Water Gardens Bio-Rocks filter media are an effective, lightweight biological media. With all the surface area but 25% less weight than lava rock and half the weight of gravel, expanded clay Bio-Rocks are the more stable, less abrasive alternative to heavyweight bio-media! Comes with a 5 year warranty.
Bio-Rocks, 0.50 cubic feet
Bulk size ships by truck freight, which requires that you be present at time of delivery. Freight company will call to book appointment.