• BioBalls are a filter media that will help grow beneficial bacteria to keep your water clear and your pond healthy.
• Each box has (100) BioBalls and (1) mesh containment bag.
• Each individual ball has (30) square inches of surface area to grow bacteria.
• Unlike other filter media, BioBalls never have to be replaced!
• (1) box is recommended per 1000 gallons of pond water.
• Highly recommend for use with waterfall filters.

Check out our blog for more info on biological filtration.