Stovepipe style overflow operation

[KurtsReef]

My 75 gal tank has stove pipe style overflow and return, the overflow on the right side and return on the left. Each hole in the bottom of the tank is about 5 inches in on each side, the "Stove pipes" rise up and the overflow has a cap with a straw in it which is supposed to help with noise.

I threw out the paper that came with it instructing how it operated, and have no idea what brand it is ...internet searches have left me still looking. I put a stronger pump on as I was never able to fully utilize the overflow capabilities of the old pump, but now I cannot get rid of the gurgling sound.

Anyone else have these or understand them enough to explain this too me?

 

[bound_for_obx]

You might find some help from these links...

http://www.dursostandpipes.com/
http://home.nc.rr.com/stockmanreef/

You might also try looking around this site, it is full of great info

http://www.melevsreef.com/index.html

 

[KurtsReef]

Possibly some images will help, these are a bit different from any overflows I have seen.

This is the overflow as seen from the front of the tank:

This is a view from further back:

And this is the view from the top:

It is odd, it will go for a long period of time making the sucking noise and then be silent for a long period of time. Last night it was making the gurgling for a few hours and quite frankly had me wanting to buy an aquarium with a better overflow as I have a feeling this would be considered bottom of the barrel quality wise.

Any insight into this overflow system is appreciated.