Noisy sump! Going insane! Help!!!

[rossb]

I am not trying to open a can of worms here by using the dreaded abs reference...OK... but I have a similiar setup. My problem is I am using two rear overflows that sound like niagra falls. I have quietened them a bunch by adding foam and bio balls. My sump on the other hand is very quiet, and I expect this to be a bit of luck. I have two drains and at the bottom of each is a 90 followed by a run of pipe (1 1/2 abs) and at the other end another 90.

I was curious about the durso standpipe reference and I think it solved my noise problem in my tank...and gave me two my refugiums...

good question