Gurgle/Bubbling Noise from overflow

[Pntbll687]

Ok. Been awhile since I needed some plumbing help.

I have a almost 3yr old 180g tank with a single durso overflow, feeding into an eshopps r300 sump. I would always hear a slight trickle noise of water in the sump but nothing crazy.

Recently there has been a bubbling noise coming from the plumbing on a inconsistent basis. I can see the bubbles come out of the pipe that goes into the sump. I've taken the plumbing apart and snaked everything to make sure there were no obstructions.

Any ideas on what is going on? I'll get some photos and possibly a video up as soon as I can.

 

[blaxsun]

Do you have a gate valve on your main overflow?

 

[Pntbll687]

Do you have a gate valve on your main overflow?

No, it's a single durso pipe

 

[blaxsun]

No, it's a single durso pipe.

I think you're limited to playing around with the pump speed then to resolve it.

 

[Pntbll687]

I figured it out.

I had my ato line in the second open drain pipe on the sump, and it had moved below the water line. Every time the ato kicked on it would send bubbles through the line and into the water.