Herbie Overflow Fail

[Seth81]

Originally Posted by sphelps

Yeap two completely separate drains are key although I've never seen it reduce flow but only create the annoying water echo type noise through the back up. It's interesting it had that effect with you.

The reduction in flow I mentioned is becuase when the water is above the primary drain a true siphon isn't achieved becuase air is being drawn in from the secondary pipe. The other kinda crappy thing about this is becuase soo much air is being drawn in the water splashes like crazy in the sump! I've seen the water spalsh up 2-3 feet as air bubble makes its way to the sump!