Safe is the complete and concentrated dry conditioner for both fresh and salt water. Safe removes chlorine, chloramine and ammonia. Safe converts ammonia into a safe, non-toxic form that is readily removed by the tank?s biofilter. Safe may be used during tank cycling to alleviate ammonia/nitrite toxicity. Safe detoxifies nitrite and nitrate, allowing the biofilter to more efficiently remove them. Safe is non-acidic and will not impact pH. Safe will not overactivate skimmers. Use at start-up and whenever adding or replacing water.