100 pezzi Acquario Bio Balls Filtri per acquario Nero 16MM

Great for fish tanks, to promote gas exchange and increase dissolved oxygen levels. Great for tropical fish farms, ponds, waste water systems, etc. For use 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. Color: Black Material: Environmental Plastic Quantity: 100pcs Dia: 16mm Package List:100 x Bio Balls Note:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.