Jack, I'd like to go back to the top and mention that if you're using saturated kalk, you should NOT need to supplement alkalinity alone. What is your Ca and alk levels for, say, the last three tests?
BTW, that washing soda has a surfactant added, as per communications with the manufacturer.
Washing soda can be made by heating baking soda in the oven at 400F for an hour or so.
Randy has tons of info on this stuff....
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Brad
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