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.
Want to see more aquarium filter media? Shop all aquarium filter media and spare parts.