you have too much flow going thru your durso pipes, that is why you are getting the sound, noise. THe only way to fix this, is to back down your pump with your gate valve or ball valve or get a bigger overflow pipe. Basically you would have to go with a bigger hole diameter.
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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