I have an Emperor 400. I've read in numerous places that it is recommended to run it without the bio-wheels. But I find the jets make too loud a noise without the wheels in place. Is there a way to dampen the noise of the jets without the bio-wheel in place?
What I did a while back was take the caps from my api test kit vials and put over the end of the jets. Worked like a charm. I would think you could silicone the ends as well.
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