When I measure pH in the cooled wort before pitching, I find that it is higher than it was when I measured it towards the end of the boil. It is maybe about as much as 0.2 higher. That's pretty annoying, and I don't understand why it should happen. One possible answer - which I actually find hard to believe - is that it's caused by the Supermoss I'm adding 5 minutes before end of boil. Any thought on this? NB. I always measure cooled samples.