Activated Carbon improves water clarity in fresh and saltwater aquariums. It provides superior adsorption qualities, eliminating odors, discolorations and impurities. Premium, research-grade chemical filter media Helps promote healthy, crystal clear water Highly adsorbent – removes odors, discolorations and toxins Improves fish health Will not raise phosphate levels For best results, replace every 4 weeks For use in freshwater and saltwater aquariums