So, since I use distilled water and build per grain bill, if I add 1.5 Camden tab crushed as well as Brewtan-B, I can adjust my starting water profile from all ‘0’ to -20 ppm Ca, +20 ppm SO4, and ‘x’ Na. Correct?
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Well it all depends. Let’s make some assumptions and do an example:
Strike volume = 8 gallons
1 Campden Tab is 75% Sodium Metabisulfite and weighs 550 mg
So for 1.5 tablets we have 825 mg total of which 75%, or ~619 mg, is Sodium Metabisulfite.
So 619/(8 * 3.785) = 20.4 mg/l or ppm of Sodium Metabisulfite is used to treat the water.
We always assume a potential of 101 ppm of SO4 and 24 ppm of Na per 100 ppm of Sodium Metabisulfite (use 89 ppm SO4 and 35 ppm K per 100 ppm of Potassium Metabisulfite). So for the doing described above, you’d get:
(20.4/100) * 101 = ~ 21 ppm of SO4 and (20.4/100) * 24 = ~5 ppm of Na.
As for loss of Ca from gallotannin, I don’t deny it but have never accounted for it and have not noticed any I’ll effects.
Hope this helps. If you have any questions about our spreadsheet, let me know. It’s very intuitive once you get used to it and I’m sure I could dig up a less busy older version for you if you’d like.