@mixer911 hello, I installed my shadow overflow. Overall I’m happy with this but my issue is the water flowing into the teeth and there’s a running water sound in the overflow box. Can you please confirm if the height of the water should be adjusted with the gate valve? If so how much more?
Since you haven’t gotten a response from a company rep, I will attempt to help.
From my understanding, the height of the water needs to adjusted using your secondary drain, not using your gate valve. You want the water to rise in the rear box so that both bulkheads are covered. If you close your gate valve more, water will rise but will eventually stop rising because the secondary drain takes over. If you raise the water using your gate valve to the point where the secondary drain is submerged, it will become a full siphon drain, no longer functioning the way it was intended. The only way to raise water, and keep the original intent of the beananimal set up, is make your secondary drain higher. In my experience, when I got the drain high enough to submerge both bulkheads, the U pipe was too high to install the cover on the rear box. Nor was I comfortable with how close the water level was to the top of the rear box.
Anyway, none of this worked for me but it’s my understanding of how to “fix” your noisy over flow problem. Good luck, I truly hope it works out for you. Keep us posted please.