Bio Balls 1 Litre

This one-litre bag of bio balls is sized for large sump filters, trickle towers, and wet-dry filtration chambers in aquariums of 200 litres and above. The hollow-core plastic construction tumbles water into oxygen-rich films, accelerating aerobic nitrification. Because they never compact, flow resistance stays low and consistent over years. Unlike submerged ceramic media, bio balls used in the dry portion of a trickle filter maintain direct air contact, preventing anaerobic zones and nitrate accumulation within the medium itself. The larger one-litre volume provides an economical option for hobbyists building or expanding sump filtration systems, particularly in reef or large cichlid setups where biological load is high.