The Planted Tank Forum - View Single Post - How to calibrate my ph meter?
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post #10 of (permalink) Old 11-25-2012, 06:11 PM
Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Posts: 10,505
Using the powder it came with, did you mix these powders with RO or distilled water?

You ought to be able to use RO or distilled as a 3rd reference, but if either of these are exposed to the air they can pick up CO2 and the pH of this will be lower. No way of telling.
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