Description: Bio balls are filter media for freshwater and saltwater wet/dry systems. For efficient biological filtration. For use in fresh & saltwater aquarium and ponds. You may gently rinse with water from the aquarium if excessive buildup. Quantity: 30pcs. Specification: Material: PVC + Biochemical cotton Ball Diameter: Approx. 40mm / 1.57inch Color: White Package Includes: 30 Pieces Bio Balls Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement
