"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?
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