Noisy overflow is driving me CRAZY!!

[surgeonfish]

Here is the Durso Standpipes Portal with instructions on how to build your own durso standpipe:

http://www.dursostandpipes.com/

My overflow probably has 10 gal capacity and it is clean. I have never heard of water becoming stagnant in an overflow using a standpipe. You need to drill a small hole in the top of the standpipe so you don't get a girgling noise, but usually they are fairly silent.