Jaide Posted January 8, 2015 Report Share Posted January 8, 2015 I have a 304B which is absolutely silent. I bought a 303B for a smaller tank and it makes a rattle coming from the impeller it seems. I have tried everything to shut it up and in the end the seller sent me a complete replacement and this one is making the same noise. So, is the 303B simply noisier than the 304B as it's doing my head in! Quote Link to comment Share on other sites More sharing options...
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