Bio balls are small, pegged plastic balls mainly used as the biological media in ponds. These little plastic bio balls have TONS of surface area for the growth of bacteria for filtration. There are approximately 80 BioBalls per gallon, and at 2.7 cubic feet, there are approximately 1600 BioBalls. They are really simple to use: place into a mesh bag and drop into the pond filter.
Extremely durable, lightweight BioBalls are easy to clean and reduce channeling
Each BioBall is 1.5" in diameter with approximately 25 square inches of surface area
2.7 Cubic Feet - Approximately 20 Gallons - Approximately 1600 BioBalls
Note: do not clean the BioBalls once they are cycled, or you will risk killing the beneficial bacteria that have grown on them, which are necessary for biological filtration.