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Ah, just watched your video. I've never seen that before either. So is the issue that the return siphon doesn't stop? I don't understand why it fills the sump so high when the power stops?
I'm kind of annoyed they didn't build it how I asked though - I sent a detailed diagram showing exactly how I wanted it. This is just a load of faff I didn't expect, and it means it's going to take longer to get it all up and running.