Small update on building a Skimmer Silencer
I was having some gurgling noises coming from the intake of my skimmer. I posted on the forums and a few canreef peeps gave me some advice
orginal thread:
http://www.canreef.com/vbulletin/showthread.php?t=68009
Im going with the design elements of:
i took their suggestions and altered to my liking. One think I didn't want to do is over extend the air hose longer than it currently is. So i tried to minimize the extension. I'm assuming the longer the 1/4 line is the harder it is for the skimmer to pull air.
I didnt want to have it hanging inside the tank as the diagram would indicate. I also didnt want water to leak in and I didnt really want to silcone it and I didnt want to prime/seal it. So i made it backwards and a "L"
The basic Idea from what I gather is two tubes, inside a big tube so the sound gets trap inside the big tube but the air keeps getting sucked in
I used Hard 1/4 line that is used in RO/DI unit for the small tubes and 3/4in pvc for the large tube
As you can see from the above picture its a nice L shape so it can hang on the outside of my sump.

Most other diagrams show air being pulled from the top down to the bottom but with my L shape I have it pulling bottom to bottom.
And below you can see how the hard plastic slips tightly into the soft plastic from the skimmer.
I was very shocked how silent it got. I was planning to stuff the silencer with some foam but it didnt need it.