Originally Posted by brewmeister13
In the section that talks about "Factors affecting haze formation" he mentions Mash pH. He states to take a hot sample and that it should be between 5.3-5.4. Corrected for temperature it is around 5.1-5.2 I believe.
First off, the advice to make the measurement at mash temperature is bad because nobody else does this (well, actually, if this guy is doing it there are, presumably others that are doing it too) and second, because of the stress on the electrode, which he refers to.
Second, pH at room temperature is is higher than at mash temperature so his 5.3 - 5.4 would translate to some higher value depending on what his mash temperature is. This is another disadvantage of stating it at mash temperature - you have to say what mash temperature is. Assuming that it is, in this case, 150 then the pH's would be 0.24 higher than that at room temp or 5.54 - 5.64. He is right that you wouldn't want to be higher than that. My personal opinion, is 5.4 - 5.6 (at room temp) but that is just my opinion to which I am entitled as I have the requisite anatomical feature.