You mayjust need to fool around with it until you find the right setting. When i started mine, water was coming in, so i turned it down and finalyl got the right palce. Where i have mine set now, there is no foam that enters the collection cup if i sit and watch it for a few minutes, but if i walk away and come back an hour later, it has pushed some of the foam up into it. i change my collection cup and clean it out about every 3-4 days now.