Aquarium Filters Ball

The bio ball provides a larger, multi-faceted biological filtration area to help support the growth of beneficial bacteria. Features: Great for fish tanks, to promote gas exchange and increase dissolved oxygen levels. Great for tropical fish farms, ponds, waste water systems, etc. For using with wet/dry filters (here is not included), to improve biological filtration. Aiding in the critical gas-exchange process that is needed for successful biological filtration. Specifications: Color: Black Material: Environmental plastic Quantity: 50pcs Diameter: 18mm / 0.7in Package Information: Package size: 16 * 12 * 4cm / 6.30 * 4.72 * 1.57in Package weight: 63g Plastic Packaging Package List: 50 *