I really need help. (Hopefully with a Herbie style drain)

[sphelps]

You may need a larger standpipe. Also the drain should be one size smaller than the standpipe, for example if standpipe is 1.5" drain to sump should be 1.25".
Does the overflow drain line go straight down into the sump? It sometimes helps to run a section of the drain line horizontal to slow it down.

Do you have dual drains in the overflow? Or just the one? What size? It can be really hard to have both a high return flow rate and very quiet operation with a single drain setup.

[rocketlily]

"on top of the durso... do you have a hose for air to get in? try adjusting the hose up or down to let the right air mixture in"
On top of the durso is a cap with 8 - 1/16" holes that I can cover/uncover.

"how far does the water fall in the overflow? what is the sump and tank return plumbing size? is ther a air hose in the durso top?"
Tank height is 20" and water in the overflow is 17" with a 20" drop to the top of the sump.

"You may need a larger standpipe. Also the drain should be one size smaller than the standpipe, for example if standpipe is 1.5" drain to sump should be 1.25".
Does the overflow drain line go straight down into the sump? It sometimes helps to run a section of the drain line horizontal to slow it down"
Standpipe is 1.5" and drain is 1.5" with 2 - 45's. Would not reducing the drain size force the water out faster?

[sphelps]

Originally Posted by rocketlily

Would not reducing the drain size force the water out faster?

Only if pressure exists, the water will fail due to gravity so unless the pipe is full velocity may actually decrease due to pipe wall friction. But the main purpose is to stop the air from entering the drain and stay in the standpipe exiting through the vent hole(s). Running a horizontal section will also help, it will slow the flow and cause the pipes to flood better again keeping air in the standpipe not the sump. It really sounds like you would benefit from a Herbie style overflow, but I'm guessing you only have the one drain?

[Marlin65]

Originally Posted by rocketlily

"on top of the durso... do you have a hose for air to get in? try adjusting the hose up or down to let the right air mixture in"
On top of the durso is a cap with 8 - 1/16" holes that I can cover/uncover.

I would say get rid of this cap and put on one with a single 1/4" piece of hose that you can adjust up or down, and if that does not work you might want to look at changing some of your plumbing Sphelps way.