![]() ![]() If the level gets too high the airline is cut off from air and it will convert to a full siphon and flush the box. The downturned elbow and airline on the secondary will help contain any trickling noises. Alternately, just make sure you have enough water over the bulkhead so it can't suck air and you'll be fine. Even a short plate over the bulkhead will work. Anything you can do to break it up will work. It's like that little suction vortex when you drain a tub. They are there to help reduce vortices and the sucking noise associated with them. I run an oversized emergency overflow pipe on my Herbie with just a trickle over the emergency and I still need to adjust the water level every so often so it's not perfect by any means. The Bean adds the secondary pipe to even the water level and avoid having to adjust the valve from time to time. You can consider the first pipe of the Bean and Herbie designs the same. The Bean trickles a tiny amount over the secondary so the water level in the box stays more consistent. In the Herbie design the water level will fluctuate over time as the pump never flows a perfectly even amount all the time. ![]() ![]() A simple bulkhead fitting at the bottom is fine, the water level would be set by restricting the flow out until water just trickles out the secondary pipe. Also, you don't even need a standpipe for the primary drain. You can simplify the design to just the standpipes as shown in the first post. ![]()
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