SeaChem Purigen 100ml

A premium synthetic filtration resin that removes ammonia, nitrite, and nitrate in saltwater tanks. It is  a macro porous synthetic polymer that removes soluble and insoluble impurities from water before they breakdown into harmful substances. It will not affect trace element levels and will clear up any haziness in the water. It changes color from pale blonde to dark brown / black and can be regenerated by placing in a solution of bleach and water.