Instead of adding KCl solution to my refillable pH meter, like mentioned in the booklet that came with it, I exchange all of the old fluid for new KCl solution. Afterwards the electrode seems more sensitive and it gives a more stable reading.
I have never experienced an actual lowered level of KCl solution in the probe every time I check, so according to the booklet I don't even have to add solution. (I always keep the electrode submerged in storage solution and refresh it afer every reading btw.)
Can anyone explain the reason why the electrode seems to function even better this way than it already did?
I've read several meter instructions from different brands, and here and there I read the use of methanol or IPA for cleaning certain substances.
Wouldn't this damage the membrane around the electrode?
(I only clean with a highly diluted dish soap solution and rinse it with distilled water, for the rest I only rinse with distilled water, nothing else).