overflow gurgling?

I have two 1.5 inch over flow strainers on elbows as my over flows and they make a ton of noise. I have looked around and cant really find an answer to my problem, or really think of any idea's either. I have posted pics any help would be great.

<a href="http://s691.photobucket.com/albums/vv278/mic5486/?action=view&amp;current=overflow3.jpg" target="_blank"><img src="http://i691.photobucket.com/albums/vv278/mic5486/th_overflow3.jpg" border="0" alt="Photobucket" ></a>

<a href="http://s691.photobucket.com/albums/vv278/mic5486/?action=view&amp;current=overflow2.jpg" target="_blank"><img src="http://i691.photobucket.com/albums/vv278/mic5486/th_overflow2.jpg" border="0" alt="Photobucket" ></a>

<a href="http://s691.photobucket.com/albums/vv278/mic5486/?action=view&amp;current=overflow1.jpg" target="_blank"><img src="http://i691.photobucket.com/albums/vv278/mic5486/th_overflow1.jpg" border="0" alt="Photobucket" ></a>

 

You will need to redo the links. Click on the 4th option and paste to the post.

 

is it a hob overflow or is the dank drilled? if drilled is there more than one hole?

 

sorry about that, thanks for the help!

 

They are drilled, there is 2 of them

 

make one your main and one your back up. On the main one you are going to want to add a gate valve (not a ball valve) then you can adjust the main one so it runs a full flow (by choking it down) and is not sucking air (mine still suck some but is quiet). You need the emergency overflow to be slightly higher than the main. I think it's called a bean or deroso overflow if you want to look it up. Reefsparky built one not too long ago and it seemed he knew a little more about it than me.

 

i dont know if this is true or not but i have heard that if you put tubing in the middle of the pipes it helps but im not sure.

 

Will that lower my flow rate tho?

 

ya there is a method of venting the air by putting tubing in it and adjusting it to the right level. I read it's finicky even if you get it dialed in right, I think people do that when they don't have the back up hole.

 

you want to match your main to your flow rate, so no it will not. I know I way over-sized my tubing, so I'm just chocking it down to match.