Zeo-Carb is a premium blend of Carbon and Ammonia Remover that eliminates water impurities, odors and discolorations, while also removing toxic ammonia. 2-in-1 premium activated zeolite and carbon 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