Right you are sir about removing the CO2. Thanks for completing the principle.
I wonder if using the pickling lime, if there is a need to boil or maybe just use warm water? With the OH- from the Ca(OH)2 converting the bicarb to carbonates, you would remove all the bicarb and probably precipitate out some extra chalk in the process, right? Maybe just do a quick boil and then add the pickling lime to let sit in an insulated cooler with air circulating from bottom or the spray action you talked about?
Seems like a lot of energy to get out the carbonates by boiling. Your thoughts?
EDIT: I reread your above post, looks like you answered the question on whether you need to boil or not.