1 gram of baking soda should raise the dKH by 1 unit. You could try measuring a few minutes after dosing 1 dKH to make sure that the kit is working, assuming the kit is precise enough. What kit are you using?
It's possible in theory that the alkalinity is precipitating rapidly on some surface (like a heater), but that seems unlikely at the moment. If you see any whitish or tannish buildups, that'd be a sign, though.
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Jonathan Bertoni
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