• Easy Box filter refill with activated carbon, designed for Tecatlantis Mini Biobox and Biobox filters • Helps keep water in optimal condition, promoting the development of aquatic species • The activated carbon removes organic waste, bad odors, colors, and toxins from aquarium water through chemical absorption • Each type of refill has a specific function in water treatment and cleaning • It is recommended to replace the refill monthly, depending on the type • Size XS, suitable for compatible filters