Does anyone really care whether he gets 1.8 mg/L sodium or 3.3 mg/L potassium? These are the amounts required to treat water at 3 mg/L chloramine (see table in Sticky,
https://www.homebrewtalk.com/f128/campden-tablets-sulfites-brewing-water-361073/).
No, just that I had just heard that the dosage for water treatment is not the same when using units of 'campden tabs', since they mix and match the active ingredient (by weight only?). Also, I usually only see the little medicine bottles (for <$1/oz., by the way) of pure KMeta, not NaMeta. The main benefit of the pure product is there is no grinding/crushing needed, since it dissolves almost instantly, which seemed like the impetus for his desire to premix (although measuring a larger diluted volume might also be easier and more accurate). Also no 'cutting' tabs up, since it is available as is in salt grain size portions. I just eyeball it, myself. I pinch here, a dash there. As you said, it isn't that much added salt, even if you overdo it a bit.
I have read your post/report before, but it is fairly long for someone looking for a quick dosage guideline, especially a volumetric one for when your scale isn't handy (or you are just lazy, like me most times). After some protracted reading, I found someone who had converted worst case doses into tsp, dashes, and pinches. Also, about a hundred other posts (many with incorrect info) will show up in a search on the topic. It is a shame the Wiki isn't used more often than it is, especially since there is a time limit on editing posts.
Get a small (~2oz) container of pure Kmeta. I hear that campden tabs can contain either NaMeta, or KMeta, depending on the day they are made.
Common dose is 1/16tsp/20g gallon.
Strange about ther earlier post saying campden tabs are 1/32, as I had heard one campden tablet treats 20 gallons.
For wine making, to kill wild yeast, use one campden tablet per gallon or 1/4 tsp K meta for 6 gallons.
As for conditioning water for brewing one tablet for 20
may be right.
Not sure what the color war is about. It was obvious to me, even after the OP's first post, but certainly after his one stating it, that he was using it to remove chlorine/chloramine.
You
stated that a campden tab is 1/32 tsp of kmeta/nameta. The recommended (worst case) dose for chloramine treated water,
as I have heard many times, is 1 tab/20 gal. The recommended volumetric dose,
as I have heard many times, of pure Kmeta is 1/16 tsp for chloramine. Something is strange with one of those dosing recs, not to mention your mass equivalent
you stated as 055mg KMeta/campden tab, which sounds even stranger.
The link a few posts earlier has the dose by mass, which I can't recall with certainty at the moment.