Dealing with Chlorine and Chloramine in Aquarium Tanks
Chlorine and chloramine are chemicals which are commonly added to tap water by water companies to make it safe for drinking.
Chlorine has been used for many years as a water disinfectant however recently many drinking water suppliers have chosen to replace chlorine with chloramine for two important reasons---first, chloramine lasts longer than chlorine, and second, it does not react with organic molecules as readily as chlorine does. The products produced by the reaction of chlorine with organic matter can be toxic to people thus using chloramines can reduce this possibility of toxicity.