The figures, for anyone assembling their own picture. If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way. Most of the apparent contradictions in these threads dissolve at that step.
That is the short version; the long version is somebody else's post.
A narrower follow-up, since the general answer is now clear:
How long did you give it before you decided it was working?
Dr.PathRoch said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
This is where I part company with the consensus forming above. Filing an objection on the n=1 problem. Personal experience is genuine evidence about one person and very weak evidence about anybody else, and this thread keeps promoting the first into the second.
Correct me if the detail matters more than I have assumed.
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Shop Reference StandardsDr.PathRoch said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
Correct, and worth adding that it is reversible. Nothing being described here is a one-way door, which changes how cautious it is reasonable to be.
Reporting back.
Update: the thing I was blaming turned out not to be the cause. Leaving the original post as written rather than editing it, so the mistake stays visible for whoever searches this next.