Quote:
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.
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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.