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Size:100-Ounce Acurel extreme activated carbon pellets is the most effective medium to clear aquariums of toxic organic substances, discoloration and foul odors. Proven in laboratory tests to be 3 times more effective than other carbons. Extreme carbon pellets are the professional's choice. They contain large pores allowing them to absorb and hold more contaminants, which is vital to attaining the extreme removal of chemical and organic pollutants and toxins. For use in all fresh and salt water aquariums. Available in 5 sizes for all your filtration needs.