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Fluval G3 Tri-Ex cartridge is for use with the Fluval G3 advanced filters and combines the binding power of Fluval G3 phosphate, nitrate and carbon for an all in one pollution management solution for fresh water aquariums. With the continued use of Tri-Ex, nitrates, phosphates and organic pollutants remain under control ; the G3 cartridge binds over 5000 mg (or more than 15 mg/L in a 300 L aquarium) of nitrate and over 600 mg (or more than 2 mg/L in a 300 L aquarium) of phosphate. The specialized mesh size of the carbon component maximizes the surface to volume ratio for optimized performance.