My Marineland 200 bio-wheel filter's impeller in my 29 gallon tank kept making a grinding noise and would often stop turning. I could have replaced the whole filter for $36 but my guess was the impeller was worn. I checked the shaft of the impeller and it had some side to side play. I figured a replacement impeller possibly would solve the problem. I ordered a replacement impeller that was available on Amazon for $15 shipped. Got it today, installed it, and now the filter runs like new.. The filter is very quiet and runs efficiently now. If your HOB filter gets noisy or stops working, check your impeller. Replacing the impeller takes about 30 seconds and can resolve an inoperative filter.
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