All of my Bean Animal drains are 6" below the water line. They work fine right now but every time the power goes out the water level bounces around for a while before it re-adjusts. I should probably shorten the pipes.
I have a Hammerhead as well working at 80% wide open in the basement. My issue was with the main siphon. It wouldn't start up and my open channel would become my main siphon making loud gurgling noises. The problem was with air being trapped inside the elbow in the overflow box of the main siphon. Drilled a tiny hole at the highest point of the elbow. No more issues.
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