Bean, I am having trouble getting my overflows to restart normally. My system appears to be the same as your design. It runs great, but upon restarting it continues to cycle or purge itself until I open the siphon valve back to fully open. Then the system will regulate itself and I can close it back off some. Nothing else seams to work. I have three compartments in my sump and one drain line runs into each one. I cut the return PVC to about 1” above the normal water level and then went back and drilled some holes to help the air escape the returns. Am I missing something? What can I try?
