The Filter Pro Super Activated Carbon Fine Filter Media traps micro and macro organic particles, foreign debris and excess fish food for crystal clear water in your aquarium or pond. This fine density pad is infused with carbon, so it also absorbs odors, toxins and helps with discoloration, promoting a healthy aquatic environment. Easily cut to fit for multiple applications. Great for sumps, refugium's, hang-on filters, prefilter boxes and more! Chemical and mechanical dual stage filtration. Safe for freshwater and marine aquariums, ponds and water gardens. Made in USA.