Intake pipe making loud noise

[showjumper_girl2002]

My intake pipe in the overflow box is making a horribly loud gurgling noise. It appears that it's getting air as the pipe opening isn't fully submerged. I figured I could probably add a piece to the pipe but don't want to do anything that will negatively affect the flow. It's the pipe on the right in the picture I attached.

 

[KrisReef]

Can you lower the pipe at all so that it becomes submerged?

 

[bevo5]

I'd submerge and put a strainer on it and see if that helps.

 

[Pistondog]

I had a similar issue; the bubbling/gurgling.
You need to give it a snorkel.
I inserted a piece of tubing about 1/4 the diameter of the pipe. one end in air,the other end a foot or so into the drain, past the bend.

 

[mfinn]

It can be tough to quiet a single drain.
If this were my tank I would convert your return pipe to a drain and plumb the return line to a over the back wall return.
With 2 drain lines you would do what's called a Herbie drain.
They are very common and usually very quiet.

 

[showjumper_girl2002]

Thanks for the ideas!

 

[4tanks]

Put another 90 degree angle on it pointing down into the water

 

[Auqaman]

Is there any type of valve on the return line to the sump? Closing in on it will solve the problem if you have one

 

[mfinn]

If you have a single drain system, restricting the flow by using a valve only spells disaster.
By restricting the flow, the chances of anything minor going in it makes the chances of a overflow likely.
May not happen right away, but it can happen and it will most likely be at night or when you are away.

 

[Hilltopreef]

4tanks above is correct. It should have a second elbow inserted into the existing one pointing straight down. The drilled whole with the airline adapter can’t vent air while the air is pouring out the front.