I learned about something similar from some nutrition professors I work with. One told me that the pH of distilled water changes over time due to leaching from the glass bottles.

On Thursday, Jan 20, 2005, at 11:36 Asia/Tokyo, Mike Monett wrote:

 And I found that cheap Chinese glass containers can leach  ions into
  the cs,  so  the uS reading increases constantly day by  day.  But I
  hesitated bothering  you since I could see the cs turning  yellow by
  itself, which it doesn't do in other containers.


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