Overflow help

[SCReef'n]

So I have an Eclipse L overflow with a "bean animal" style overflow (two horseshoe pipes and a straight emergency). The problem I'm getting is that periodically I get the flush. The flush get more frequent at high return pump flows. For instance at low speed it might "flush" once a day and at higher speeds its almost constant. The second siphon has a 1/8 hole on top to allow air in. My return pump is a Reef Octopus Varios 4. I'm starting to suspect that the pump has some variability in the settings and the swings are causing this. FYI when it runs properly its dead silent so Im fairly confident in the systems ability to perform as designed but something is periodically upsetting the applecart. Thoughts and help would be appreciated

 

[Flippers4pups]

Are you at full syphon when it's running properly?

 

[SCReef'n]

If by full siphon you mean the primary siphon line is full submerged then yes

 

[Flippers4pups]

How long has this system been running?

 

[SCReef'n]

Two weeks

 

[SCReef'n]

Could it be the amount of water the return pump is sitting in? I can't find any information online about minimum depth, Its currently sitting in about 8 inches of water

 

[SCReef'n]

Figured it out and wanted to close this out. When I increase the depth of water in the sump this problem went away. Water was barely flowing over the top of the baffle to get to the return pump and causing the system problems with circulation.