Are you testing fairly soon after dosing?
With Randy's formula, you should be seeing some increase with that dose. 125ml in 150g would give just over 1dKH.
You mentioned Sodium Bicarb, then sodium carb. Which are you using?
Are you using Randy's mixing instructions, or what other instructions?
Have you used another test kit to confirm your results?
How many total gallons do you estimate you have?
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