GhL probe cleaning

can you also use citric acid? Do you soak them in vinegar, and for how long?
 
For me I do about 2 mins in Vinegar and then a soft toothbrush to clean them. Then I set it in RODI water for like 10-15 mins.

Recalibrate then probe and back in the tank.

I have used citric acid from BRS also.

Sometimes I have had to do a couple of soaks just because something would not come off the first time.
 

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