Super Activated Carbon For Freshwater, Marine & Reef Aquariums, Fish, Corals, Plants & Invertebrates. 12 Ounce Box - Three 4 Ounce bags. Use In Aquarium Filters, Terrarium Filters, Hydroponic Systems Super activated carbon ideal for freshwater aquariums, marine aquariums & reef aquariums containing sensitive fish, plants & invertebrates. Three 4 ounce bags. Use in aquarium filters, terrarium filters, & hydroponic systems Super-Activated carbon granules absorb many disolved containinants, odor, toxins, and discoloration. Use with Aquarium Masters Bio Rings media to promote colonization of beneficial bacteria essential to a healthy aquatic environment Convenient 12 ounce size package, contain three 4 ounce bags. Designed to more effective in removing harmful chemicals, increasing the health of your pets Prevents the buildup of harmful elements and suitable for all filters. Other Aquarium Masters & Blue Spotted items to consider, air line tubing, fish net, submersible heaters, refugiums, nirate pad, ammonia pad, polyfiber pads, power filters, air stones, bio-rings, UV sterilizer, heat pads, & heat lamps