Durso hole questions.....help!

[miserkris]

My durso in my megaflow has 2 very small pin holes.
I run a quite one 700gp. Mine is a 75g. When in full valve open there is that classic water level rising lowering in megaflow......until air is blasted out the return.

I checked durso website, it said remedy is to have drain line end just 1 or 2 " below sump water surface.....so I cut it, now its 2"below surface.

I still have the same issue....its only when return valve is half open, the level in megaflow is stable..ie at half the dia of the durso's horizontal pipe.

In order to utilize full flow....and open return valve fully open, should I make the durso hole on top bigger, if so by how much....how about 0.5" dia.?

This thing is driving me nuts....help!
Thanks.



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[rkaragozler]

do not make the hole .5" start enlarging the hole in very small increments

 

[House of Laughter]

If the drain is a standard reef ready tank, the 700gph is going through a 600gph hole.

I would valve back the pump to about 400gph. Be careful though, quiet ones are famous for snapping their ceramic shafts.

House

 

[miserkris]

do not make the hole .5" start enlarging the hole in very small increments

Hey, whats wrong in making that hole big right away?
That hole issue is confusing!

 

[rkaragozler]

On a durso set up, if the hole is too large you will start hearing the flow of water down the pvc, it will start sounding like a water fall. If you already made the hole, try to put a small valve on it.

 

[miserkris]

On a durso set up, if the hole is too large you will start hearing the flow of water down the pvc, it will start sounding like a water fall. If you already made the hole, try to put a small valve on it.

A valve how? You mean attach an airline and to it...a 0.5" or similar plastic valve?

In theory,a bigger hole though noisy will eliminate my water level issue right?

Thx!

 

[rkaragozler]

Did you already drill the .5" hole????
The rising, and lowering in your overflow is created because the hole on top of the durso is to small or is clogged. We call this the toilet bowl affect, If their isn't sufficient air going into the U pipe it will cause this. It can be resolved by making the hole a tad larger then it is now.

 

[Turbovr3six]

Maggie Muffler....

 

[miserkris]

Did you already drill the .5" hole????
The rising, and lowering in your overflow is created because the hole on top of the durso is to small or is clogged. We call this the toilet bowl affect, If their isn't sufficient air going into the U pipe it will cause this. It can be resolved by making the hole a tad larger then it is now.

Haven't drilled hole yet...will do tonight. I saw some google images about airline tubing with valve, gonna do that size hole....just lmk if thats not ok! Thx all!

 

[rkaragozler]

you can do that just make sure the hole is a tad smaller than the airline tubing, so it doesn't fall in.

 

[dimitrge]

I had an issue with the durso on a db 75g rr tank. It was like a toilet bowl the water would fluctuate in the overflow. I drilled the hole in the durso bigger till it stabilized. 1/16th at a time then it was good.

 

[miserkris]

I had an issue with the durso on a db 75g rr tank. It was like a toilet bowl the water would fluctuate in the overflow. I drilled the hole in the durso bigger till it stabilized. 1/16th at a time then it was good.

What return pump did u use?

 

[dimitrge]

I use an eheim 1262. I had a problem getting the water level to rise because the loc line they use is garbage. The opening on the flare is way too small.

 

[miserkris]

Did you already drill the .5" hole????
The rising, and lowering in your overflow is created because the hole on top of the durso is to small or is clogged. We call this the toilet bowl affect, If their isn't sufficient air going into the U pipe it will cause this. It can be resolved by making the hole a tad larger then it is now.

So what iam learning is....hole should be big enough for water level to be stable, but any bigger than whats needed then it gets noisy right?

Other than noise is there any other disadvantage in making hole much bigger?

Am I fully right or partially right?
Thx

 

[dimitrge]

Open it 1/16 at a time it will stabilize. The noise to the sump the gurgling if it's flex hose drill holes and use a filter sock to quiet it down

 

[miserkris]

Open it 1/16 at a time it will stabilize. The noise to the sump the gurgling if it's flex hose drill holes and use a filter sock to quiet it down

You mean 1/16" at a time? And drill holes in flex tube drain too...above water?

 

[rkaragozler]

you said you have a mega flow durso set up with 2 holes. Where is the flex tube.
Pics would really be helpful now.