Overflow water level fluctuating

[drcole]

The water level in my over flow rises and drops about 1". This all happens within about 10 seconds. No big deal other than when it's lower, noise from the overflow increases. I plan to combat this by increasing the height of the standpipe. Any opinions or comments are greatly appreciated!

 

[TheEngineer]

Sounds like an intermittent siphon. Is this a durso style drain? If so, do you have a hole drilled in the top cap?

 

[drcole]

Hole drilled in top cap, I can live with it, just didn't know if there were other ideas out there

 

[Feltman]

It might not be a big enough hole.

 

[TheEngineer]

^-- that. :)

 

[mcarroll]

You might be overrunning your drains ability to remain silent. Less flow will make the noise less or stop it.

Two to four times your display tank's volume in GPH is usually enough. Mind you that's actual flow once installed - not the pump's flow rating.

Have you timed your return flow rate since the install?

 

[drcole]

600 gph drain, flow is at about 520

 

[drcole]

I removed the 1" pvc pipe I had from the top of the sump to cut down on noise and the level no longer fluctuates. I now have a noisy sump, so any ideas?? Only thing I can think of is raising the water level so it doesn't have as far to drop