90 gal Corner Pentagon

[rocketlily]

Freshwater has been running for a couple of hours now and no leaks. Overflow is quiet as can be. Eheim 1262 pump is completely silent.

Now, here pics of the noise problem. Extremel noisy where the water is entering the sump. There are no leaks in any of the fittings, so I cannot figure out where the air bubbles are coming from. This is the same problem I had with the Durso. Changing the gate valve only raises and lowers the level in the overflow, but does nothing to eliminate the noisy bubbles. I'm sure that once I figure out how to eliminate the turbulance coming from the bottom of the drain, this will be a very quiet system.

Here's the water coming out of the bottom of the drain. (ABS is being used until I figure out how to solve this problem)


Here's the bubbles that have risen to the top. The white hose is the emergency drain. The water level in the overflow is just touching the top of the drain, but no water going down.