Bio Balls, 1 cubic foot

These plastic Bio-Balls are a great media for use in all types of biological filters. Can be used as a loose media or put in mesh bags for easy removal and cleaning Will not compact like other soft media, reduces channelizing of water around media 1-1/2" in diameter, black in color Available in one cubic foot or 4.5 cubic foot box Advantages of Bio Balls over Lava Rock Bio Balls are inert, so they won't leach any minerals into the water that can lead to algae growth, like Lava Rock. A bag of Bio Balls weighs approximately 8 pounds instead of Lava Rocks 40 lbs! Lava Rock tends to shred media bags.  Bio Balls are much easier on them!