[quote=“mabrungard”]That is the way I do it when I’m testing things out. Just dial up the dilution to 100%. That ratios the ion content to the selected water RO or distilled. If using distilled water, the Diluted Water profile should read zeros all the way across.
Are you sure that there wasn’t some other acid source in the mix? To drop the pH as low as you recorded, there would have to be a decent amount of darker crystal or roast malt in the grist, or the amount of calcium added would have to be high.
I’m surprised that the actual result was lower than the prediction. Both Kai and AJ say that there is no way that Bru’n Water is correct since it predicts a LOWER pH than their models. This result is therefore opposite of the trend that Bru’n Water typically provides. There has to be some difference between the modeled conditions and the actual conditions.[/quote]
Thanks Martin! Glad to hear I used the right approach. Calcium and dark grains were both somewhat modest.
The water amendments (3.55 gal mash volume):
Epsom salt: .9g
Cal. Chloride: 1.6g
Grist for 3.5 gal batch:
MO: 7 lb 2.3 oz
C40: 3.8 oz (3% of grist)
C120: 5 oz (4%)
Roasted barley: 2 oz (1.6%)
I did not acidify the mash. I’ve played around with the calcium and dark grain variables to see if I could create a model condition with a pH ~5.0 (and determine if I made an error in my measurements). Even if I double all of the key variables, the predicted pH is 5.11. So it’s unlikely I made a meaningful measurement error.
I’m using the supporters version 2.12. Out of curiosity I downloaded the current free version and plugged the original variables in. The predicted pH was 5.2.