Hole Size On Durso Valve

[TexasState]

After several dumb mistakes tonight; I finally got around to plumb up my tank (brand new bulkhead's been sitting dry since March.)

If my durso pipe is making a toilet flushing noise every once in a while, and the pump is pumping water up faster then the drain can feed it. What does this mean? Should I make the hole on the durso's cap, bigger or smaller. My cap have the smallest hole allowable w/ a drill bit right now. I haven't drilled a bigger hole in the cap yet becuase the battery on my drill decided to die at just the right time. :roll:

Mag 950 on a 92 Gallons Oceanic Corner Bowfront. Durso Pipe Mod. I haven't bought a ball valve yet b/c Lowes's close right now. I'd prefer not to use a ball valve.

[witecap4u]

Is the whole in the top of it. I saw one version that had a cap on top with a 1/4 hole through the side of the cap and tube, and you could turn the cap to adjust the hole size...cs

[TexasState]

Thanks, widening the hole has worked at balancing out the drain & return almost perfect. It's still pumping a tiny bit faster, so I'll go in there and widen it up a little more.

Inside the overflow, how high can I get the water to be from the overflow grill? My water is about 4 inches lower then the grill right now, and there's still a water fall noise. Is it ok if my water level is only two inches below the grill?

[Chris]

Vinh... mine is only about 2 & 1/2" to 3" from the overflow and it's pretty quiet. I also covered the top of that area with some lexan though so that helped too.

I've seen some people bring the Durso's up to only about an inch drop.

I would assume a larger fall would help with gas exchange slightly more though.

[TexasState]

Thanks! The reason my pipe was low in the 1st place is b/c I was trying to get all the piping to fits under a glass top to cut down the noise. I guess I'm going let the piping rise out higher, and use acrylic top instead, w/ a hole drilled for the pipe to pop through the acrylic cover.