Porous ceramic balls for filters

Porous ceramic balls for filters ten or forty items.
The biological balls are for the growth of biological colonies.
Reduces ammonia and nitrate levels.
Suitable for freshwater and seawater tank.

Specifications
Material ceramic
Diameter of ball 21mm and 0.82″

Notes
The real product colors may be slightly different from what you see in the images.
The product dimensions may be slightly different from what is written in the product specifications.