Uncarbonated. I recently did a Rye mild out of Zymurgy "Brewing on the ones" by Drew Beechum Nov/Dec 2012 and my mash PH was 5.38. Sparge water was 5.15 PH, Pre boil was 5.45PH and post was 5.13 PH. I was told this is a little low but we will see how it taste after the yeast gets done. Used West Yorkshire 1469. I am going off a beer style PH chart a came across. English ales 4 to 4.2 PH they say.