I feel quit stupid. But after 1.5 years with the Red sea Berlin skimmer I finally read ( Really Read the instructions) It says in there that you need to clean it. I'm such a dolt. I have always cleaned the pump the collection cup and the chamber, but I didn't even know there was a venturi in the thing. After removing shrimp molts and a pound of deleterious slim the thing works great. OK Lesson learned.
J
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