[Randy Holmes-Farley]

The effluent from such a system, if chloramine were in the water supply, would likely be ammonia. So that is likely what you need to treat for, not chloramine per se. It likely won't do too much if you have especially high copper in your water. I'd at least let it run for a bit before using the water collected from it.

An RO/DI would eliminate the ammonia concern.