Unfortunately, chloramines don't evaporate from water as easily as chorine so leaving the water to sit for a few days won't work.

For anyone else with chloramine concerns check out Vitamin C. Someone else just recommended it to me on another part of the forum and it's supposed to removed Chloramine. I'm going to do some research and I'll post back with info. This is important for any organic growers growing in Denver on the city water supply!