chlorine does evaporate on contact with air, how ever you need to know what your supply is treated with. as now many areas use chloramines which dont evaporate. a chloramine is a chlorine and ammonia molecule combined. dechlorinators treat chloramines by breaking them apart into chlorine and ammonia. so you need to make sure your dechlorinator also treats regular chlorine too, if it does ammonia all the better(no extra bioload).dingoofus;3186840; said:
you will see many old books and article will talk about dechlorinating by leaving the water out for a couple days. that only works if you have chlorine not chloramine
i use prime btw, does it all even detoxs nitrite and nitrate just for fun, although it does kinda make it a pain to test water since some test mechanisms the kits use detect the detoxed nitrite and nitrate, and then some don't. if you go to seachems site they tell what test are compatible
