Centaur® catalytic carbon for Chloramine and Chlorine removal.
Requires a gravel under bedding.
Does not last long for hydrogen sulfide (sulfur smell) removal.
If your tank is 9" diameter x 48" tall, it holds 1 cu ft. - 10" diameter x 47" tall holds 1.25 cubic feet - 10" diameter x 54" tall holds 1.5 cubic feet. - 12" diameter x 48" or 52" tall holds 2.0 cubic feet.