Seachem Safe, 4 Kg Removes chlorine, chloramine and ammonia For freshwater & saltwater aquariums Use 100 mg Safe (scoop) per each 100 L (25 gallons) as needed to reduce chlorine and chloramine or per 25 L (6 gallons) for ammonia Safe is the dry version of Seachem Prime and shares all of its advantages; however, Safe is even more concentrated than Prime