new return pump making overflow gurgle and bubble help

[flyingfish]

I added a new return pump because the other one was not strong enough, flow was diminished and getting gunky. The old one was 1050gph, the new one is 1200. I had a nice setup with the old one with a diverter valve if the pump was too strong but i never used it. I hooked up the new one with 3/4 ID tubing instead of 3/4 OD tubing and pvc/valves. So I expected more flow but it seems like it may be not able to handle it with the return to the sump? I have a u tube in my overflow which seems like it is pulling too much air suction. If we partially block that hole it stops, any help would be appreciated, thanks!

 

[smh254]

If u have a loop in the hose from the overflow to the sump that would make it gurgle.

 

[rajkovich207]

Not sure if I'm picturing what you are talking about. Is it an hob overflow or a durso? Where is the hole you are talking about?

 

[flyingfish]

it is a durso, got it from sc aquariums.

 

[flyingfish]

the drain from the overflow does not loop but sits on the bottom of the sump so it curves a little.

 

[flyingfish]

the hole is in the durso, i was reading that increasing the hole size can help but i dont want to do anything wrong. so I want to make sure i drill the right one

 

[smh254]

yeah I didn't mean a full loop. When I had mine set up and the overflow hose ran down and then came back up to drain the water it made a lot of noise. I just straightened out the hose and it took care of the problem.

 

[flyingfish]

I cut the drain tube and it is straight, but it is still gugling. What hole do we drill in the durso?

 

[flyingfish]

we increased the hole a tiny bit to insert a standard air hose line, the small ones typically used. it helped a little but not enough for sure. tried a control valve on the air hose to limit it further, did not help actually made the water level drop faster in the overflow box. so may make a bigger hole tonight and see how that goes.

 

[marine2463]

Also if you chamfer the hole it helps remember a sharp edge causes turbulence in the air were a chamfered hole flows nice with no turbulence

 

[flyingfish]

Ok drilled hole to 3/8" still making same noise. How do you get rid of the gurgling from the end of the drain hose into the sump? And the waterfall noise in the overflow?

 

[flyingfish]

Fixed it, I added a valve on the return to release some of the flow into the sump. I only had to open it a little bit, not even a 1/4 turn. quiet all the way around. :) flow is still excellent!