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Feb 26 at 15:48 comment added ealdwulf Can't upvote yet, but I would if I could @fraxinus
Feb 26 at 15:47 vote accept ealdwulf
Feb 25 at 8:26 comment added fraxinus @jimchmst this is pretty much traditional (this is how calcium carbonate got into the utility water in the first place). On the other hand, for the club soda to work, one would need a lot of time and a lot of soda - and maybe a high pressure setup of some sort. And still falls in "using acid" category.
Feb 25 at 0:22 comment added jimchmst You might try club soda, seltzer; CO2 dissolves CaCO3 converting it into bicarbonate.
Feb 24 at 20:38 history answered fraxinus CC BY-SA 4.0