1Strong absorption: it can strongly absorb certain harmful substance to achieve the removal efficiency 2Multipurpose use: it can remove the harmful substance, odor, heavy metal, purify the fish tank water and improve the water quality 3Designed with the net bag: comes with the net bag, which make it easy to purify the fish tank water 4High quality: made of the coconut shell charcoal, safe, non-toxic and strong absorption 5Healthy environment for fish: the activated carbon ensure the water quality and provides the good environment for your fish