I bought two of these pumps and to keep them running properly and quietly I have cleaned the little dust filters on the bottom of the pumps. Now they need to be replaced and so far I can't find a replacement. This is definitely something I will try to keep in mind for future purchases. Update: One of these pumps is now making a lot of noise. He is only 1-1/2 years old. I go back and forth with Penn Plax and they tell me there is no warranty and no replacement parts for this item. It worked fine while it lasted.
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