I started a batch of raspberries and lemonade. The raspberries were a combo of frozen and puree with xuam gum. I added sugar, but I had a pH of 3.2. After a week with Primer Cuvee in the primary and not doing anything, I racked to secondary and added Mont. yeast. It still wasn't doing anything and I was writing it off as a fail, but then the airlock started having pressure on it on Wednesday. Last night, I kept hearing this noise, and finally realized it was spitting raspberry foam though the airlock! I'm not use to krausen, so it was a bit full. I took some fluid off, but apparently it isn't enough because it is still doing it. Hubby says he read some where that raspberries are awful like that when making beer. Is that what is going on? Right now, I'm just swapping out my vodka filled 3 piece airlock every twelve hours. I really don't want to take more out because it is only a gallon.