State of the art filter media suitable for freshwater and saltwater wet or dry systems. You can connected the Bio-Pins together or randomly place in the filter compartment. The design of Lee's Bio-Pin Balls help produce turbulence assisting in the gas-exchange process. They allow your aquarium water to more-readily come in contact with nitrifying bacteria living on the media surface enhancing bio-filtration.

Product features:

• State of the art filter media for use in fresh and salt water wet/dry systems
• Connected together or randomly place in the filter
• Ideal surface for nitrifying bacteria
• Enhances biological filtration in aquariums
• Box of 300 small Bio-Pins