My filter starts without any problems. But after a few hours, a bad leak starts between the head and body. I've been to about a dozen pet stores here in Chicago, but I still haven"t been able to find one. Most stores tell me they dont carry the filter anymore and I will have trouble getting the O ring for the filter. The leak is between the head and body where they meet. If you have any other thougths for the leak , I would appreciate knowing them.