I got a piece of this from the same person. One day just popped into my office and said he had something for me. He's been my contractor for multiple projects.
How about a large water reservoir you treat with vitamin c, then use a pressurized pump to pump water from that reservoir to your RO/DI. This is probably going to far as well.
This is basically what I do. Except I seem to have to feed more than my fish actually need to keep my nutrients up. Caveat, I don't actually test my nutrients but I can tell based on how my coral look.
This is the one I got a while back. You can always change out a filter or 2 for chloramines. https://www.amazon.com/dp/B01HOJ55RC?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_4
Also this does not help the potential issue of the chloramines shortening the like of the ro membrane. Which is the reason for why this topic got brought up.
I understand that but in real world experience how long is everyone's membrane lasting? I know I just changed mine after 3.5 years for the first time. Granted I have very soft water.