Herbie...100% quiet, the only time I can hear it is if the water gets low from evaporation and I can hear the water from the skimmer, thats it.
Here is a link, just scroll down, lots of info on RC too.
http://www.canreef.com/vbulletin/sho...ghlight=herbie
One suggestion that many on here will agree with....use a gate valve NOT a ball valve. Even if you have to order one from J&l/Oceans, get one, it will save you time.
Hope that helps!
Jason
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60 Gallon rimless, internal Herbie overflow, ATI Powermodule, Eheim 1250, 2X Tunze 6055, Tunze ATO, Euroreef RS100, Profilux controller, TLF Reactor.
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