Vinegar and Kalk
Vinegar is great for lowering ph of kalk, just use the same brand pictured in that article; "Heinz pure white vinegar" or any other distilled brand. In addition to this, it also helps dissolve kalk mix more readily even the "kalk" sludge in the bottom of your kalk bucket/container. (I think this info is in one of the articles listed by Beverly as well.) If you follow the suggestion of 45ml vinegar/gallon using a 2tsp/gallon (10mg/gallon) kalk mix, you'll get a fairly "safe" solution to add to your tank once everything settles. You can add it all at once considering you have a larger tank (100+ gallons); use a drip line anyway but open it fully. Should take about an hour to empty 5 gallons of kalk mix this way.
Although vinegar does reduce alkalinity, the effect is negligible in Calgary as our water is REALLY hard from 122-248 mg/L or ppm (6.8-13.8 dKH). Your exact range depends on what reservoir your water is drawn from whether it be from the Glenmore in the South (very hard water) or Bearspaw reservoir in the North (not as hard as the south).
Hopefully this puts your mind at ease next time you consider adding vinegar.
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