For years, I have been buying deionized / R.O. H20 for my reef tank. I live in Fla and have a dehumidifier going all the time, collecting and disgarding the water for years. I recently started to use the "reclaimed" H2O, when I purchased a new dehumidifier. Nothing bad has happened in my tank. The guys at the local reef aquarium store tell me it is absolutely fine, especially since there is no copper in it. What are your thoughts???