Atlantic Water Gardens Bio-Rocks Filter Media Size:0.50 Cubic Feet Split-lid provides a convenient inspection

Split-lid provides a convenient inspection point for the system

Far less work to excavate and move than rocks

from handling Koi to skimming leaves or algae

5" Bio-Balls Filter Media

It is durable enough to be hauled in a truck

Atlantic Water Gardens Bio-Rocks Filter Media Size:0.50 Cubic Feet Split-lid provides a convenient inspectionAtlantic 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. SKU UPC Code Description BB0500 727429001103 Bio Rocks, 0. 50 cubic feet Bulk size ships by truck freight, which requires that you be present