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Cant get ph above 11.5 ??

Friscoirish

Rising Star
Can anyone help me? I can’t get my pH up to 1314 as high as I can get as about 11 it does turn dark, but I don’t feel it’s as strong as it should be. How can I get the pH to raise without adding any other chemicals?
 
And also: what pH measurement do you use? The most steady are the paper-indicators.

pHIndicatorPaper.png

Electronic-indicators need to be calibrated, which is a lot of extra trouble before you can get precise measurements.
 
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