The Seachem Safe, 50 G/1.7 Oz., is a complete and concentrated conditioner that removes chlorine, chloramine, and ammonia from your water. It can be used during tank cycling to alleviate ammonia and nitrite toxicity. The product is non-acidic and will not impact pH nor will it overactivate your skimmers. The Seachem Safe is the dry version of Prime and shares all of its advantages, however it is even more concentrated.