Checked my alkalinity yesterday and it was at 7dKH I generally like to keep it around 9. Seems lately,my kalk hasn't been keeping up so i've been using baking soda and Calcium chloride to supplement.I'm using the kalk at 2tsp per gal which is supposed to be full strength.I've read about using vinegar to be able to dissolve more but am unsure the amounts to use.