Seachem Zeolite is a naturally occurring, highly-porous mineral that binds
ammonia and heavy metals through an ion exchange mechanism. It has the highest
ammonia binding capacity of any available zeolite; ten times higher than some
products and twice the capacity of the closest competitor. It also removes
harmful metal ions like lead, copper, nickel and zinc. Many zeolites deplete
calcium levels in saltwater tanks, but Seachem Zeolites will actually
supplement calcium by 10 -15 mg/L. Yet, it won't increase general hardness in
freshwater tanks, where the ionic strength is low.