At work we have never had a problem until recently. We use bottled water and fresh ground coffee. Fresh brewed coffee started making the creamer some of the ladies used curdle. So I changed the coffee to a different type that I had on hand and it still happened. I changed coffee filters and it still happened. We tried a different creamer and it still happened. Then I tried a different bottled water and it stopped curdling. If someone can tell me what that's about I'd like to know. The water we were using was from one of those fill it yourself RO places that caused the problem. The water we switched to is from Walmart.