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