Thanks for pointing this out. Yes, chlorine will evaporate, but chloramine will not. We have gone ahead and added an additional question to the data entry so that folks can enter a little more information about their water source. It will not necessarily get at the choloramine issue, but will help us tease apart the results. If you DO know that your city treats your water with chloramine, id recommend using bottle or filtered water instead. You can certainly boil your water, if you like. Just make sure to let it cool before using it.