Safe, 50 g / 1.7 oz The complete and concentrated conditioner for both fresh and salt water Removes chlorine chloramine and ammonia Converts ammonia into a safe nontoxic form that is readily removed by the tank's biofilter May be used during tank cycling to alleviate ammonia and nitrite toxicity; Non acidic and will not impact ph nor will it over activate skimmers Safe is the dry version of Prime and shares all of its advantages, however Safe is even more concentrated