Seachem HyperSorb 4L (1.1 gal). Is a synthetic adsorbent that outperforms all other blended synthetic media and carbons. It has exceptional organic removal capacity: it removes organic waste, toxic vapors and other pollutants. In freshwater it will help stabilize the ionic balance and will help to control ammonia, nitrite, and nitrate. It is easily regenerated with household bleach. A 100ml bag treats 120L (30 gallons). Marine and freshwater. This item is a special order item that is drop shipped direct from Seachem.