Leaking bulkead solution?

[sphelps]

Originally Posted by daplatapus

Yeah, it looks like you have the emergency and main siphon drain tied together. You're main siphon is probably sucking air from the emergency drain. Those 2 pipes need to be run completely independent of one another and terminate under the water in your sump.

What he said. It will always echo up the back up drain when tied together, nothing much you can do about it, the pipes have to be completely separate.