Bio balls are small, pegged plastic balls mainly used as biological media in wet/dry filters.

These little plastic bio balls have lots of surface area for the growth of bacteria for filtration.

They are used as the biological media in saltwater and freshwater aquariums as well as ponds.

They are really simple to use: place them into a mesh bag and drop them into the pond filter.

Do not clean the Bioballs once they are cycled, or you will risk killing off all the beneficial bacteria that you need to filter your water.