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A: Yeast contamination is the cause of a krausen. Even heterofermentative bacteria do not produce more than a little bit of CO2 blow off. The yeast contamination could have come from not enough cleaning/sanitation. There have also been numerous reports of yeast contamination problems from popular yeast companies. We recommend buying Lacto cultures from one of the smaller yeast labs. See [[Lactobacillus#100.25_Lactobacillus_Fermentation |this page]] for details.