I did have a flood in the past over the summer and some things got wet but I bleached everything and it seemed to solve the problem for about a month. It is just very frustrating dealing with constantly having to check the food and remove 5 or 6 pieces of moldy food from a hopper or two. I may try another food soon because of this. I clean each of my bins every 4 days and use pine bedding that does not seem wet so that is not the issue. I am really wondering if anyone else has ever experienced this with Mazuri. Thanks for the responses- keep them coming.