Atlantic BB0500 Bio-Rocks, 0.5 cu.ft.

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. Use 1 box of 0.5 cubic feet of Bio-Rocks per Media Bag.

• Expanded clay bio-rocks
• 25% less weight than lava rock
• Half the weight of gravel
• Same surface area as lava rock
• More stable and less abrasive than heavy-weight bio-media