D-Chlor-It 16 oz., Caribsea. D-Chlor-It is your one step water conditioner that does all you need to turn ordinary tap water into aquarium-safe water. D-Chlor-It not only neutralizes chlorine and chloramines, but also ammonia, heavy metals, and even copper. At the same time, D-Chlor-It, replaces the skin "slime coat", adds essential electrolytes, boosts alkalinity, and reduces fish stress. D-Chlor-it even detoxifies nitrites.