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as was already mentioned, chlorine will evaporate (i think) when chlorinated water is left to sit, but many chemicals really don't. not only chloramine, but others too. if you could get a water treatment report from your local water treatment plant, you could find out what those extra nasties are. but then, to remove them, you'd have to go out and buy (or order from internet, then pay added shipping costs) expensive water treaters to take out the various things you want out.
there are 2 main things in town/city water that cause aquarists pain, and those are Chlorine and Chloramine. unless you have a really polluted water source, you shouldn't have to worry about anything else. of course, if you DO have a polluted water source, you shouldn't be using that water for anything anyway! so i would just use water conditioner, unless you are having trouble with the water you are using.
if your water IS giving you trouble, and it isn't chlorine or chloramine because you treat for that, i would go get some test kits to test PH and Hardness, Ammonia too. oh, and maybe NitrIte and NitrAte. chances are, it isn't your water treatment plant thats the problem, it's something to do with the hardness, PH, ammonia, etc.
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