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· TCMAS Member
5,667 Posts
As Resplendens suggests,

I would try using a larger diameter pvc from the drainpipe to the sump. If your using 1" now go with 1.5" PVC. From the sounds of it there too much backpressure and it isn't until the drainpipe is summerged deep enough that a true siphons starts and flushes it down the line and then builds back up again.....
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