A Durso will quiet down the overflow.
However if you want a completely silent overflow, you need to do a Herbie's overflow.
http://www.reefcentral.com/forums/sh...hreadid=344892
If have been using this method for a couple of years or more and it works great as long as you use a gate valve and not a ball valve.
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120 gallon sps/anemones/LPS reef since 2004
Apex controller
8 x 54 watt T5 PowerModule
Herbie's silent overflow system
Jebao DC 12000 return pump
Jecod CP-40 Cross-flow circulation device
Mini Bubble King 180
Barr Aquatics calcium reactor
Bucket fuge
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