Durso question

[CleanYourTank11]

Im getting the gurgle noise only from one standpipe. It's a 155 bowfront, I have 2 mag 9.5 running it. 1 is "t"d off to a uv and one is "t"d off to a skimmer but I'm bypassing the skimmer at the moment. I have ball valves on both pumps,both dursos are identical any thoughts on why this is happening? I've tried less flow and more flow, more flow quieted it down but then drained the sump and also tank drains couldn't handle the flow. I have done a bunch of these and never ran into such an issue. Thank you in advance

 

[Brando457]

I had a similar issue with one of my standpipes and honestly the reason for it was that one was actually maybe 1/4" taller than the other. I know it sounds crazy, but I leveled the two and boom no more gurgle. hope this helps

 

[CleanYourTank11]

Thanks Brando, I'm almost 100% positive that they are the exact same size but its definitely worth double checking.

 

[Tonyscoots84]

Is there a cap on top of the durso and if so does it have air vent holes on top?

 

[CleanYourTank11]

Scoots- yes sir, when I cover them by hand the gurgle stops.I'm going to try the tubing into it just to see if that helps. The other durso has the same size and same amount of holes and is practically dead and has absolutely no gurgle at all.

 

[Tonyscoots84]

it might need a bigger hole for more air behind the water

 

[CleanYourTank11]

I forgot what size I drilled them(small though) but there is 10 holes, I'll try to enlarge some one at a time?

 

[Tonyscoots84]

I forgot what size I drilled them(small though) but there is 10 holes, I'll try to enlarge some one at a time?

this is key ....

 

[CleanYourTank11]

Thanks scoots, it's not my tank I was helping out a friend. I think I'm going tomorrow, I'll keep you posted. I appreciate the info

 

[Tonyscoots84]

no problem. that is the problem behind the gurgling. needs more air behind the water.

 

[JimmyR1rider]

If you accidentally go too big you can fill some of the other small ones with silicon or you can use the bigger hole to silicon in an air valve and shut it until you get the correct flow.

Good luck, you'll get it straight.

 

[CleanYourTank11]

Sounds good to me, simple fix then.

 

[CleanYourTank11]

Good idea too Jimmy.

 

[rkaragozler]

what size is the tank? what size return pump are you using?
sometimes if you have more flow to the tank then what the durso can handle this will also happen.

 

[CleanYourTank11]

155 bow front, 2 mag 9.5, 1 split to return and uv, 1 split to skimmer and return. The reutrns are kicking, I have ball valves on both pumps. If I turn them down i get the gurgle on durso. If I turn them up the noise goes away but the drains and sump can't handle the full flow.

 

[rkaragozler]

A 155 bow front should have 2 1" drains that should be able to handle 1200 gph, assuming that the head height is 6 feet you should get 1440 gph without any restriction.
Now you say that 1 of the pumps run a uv? what size uv. every uv should have the proper flow thru it to function properly. Depending on what you want it to remove will determin flow.
2- You mentioned that the other one was also running a skimmer. which skimmer?
most of the skimmers I know of have their own circulation pump, or feed pump.
some members will take a drain, t it off and feed dirty water to some brands of skimmers.