Can you show how the intake pipes enter the sump and where they are relative to the sump's water level? (To see how you keep that part quiet too) Don't have any pics at the moment, but these pipes are 1-2" below the sump's water level, to avoid any splashing sound.
Looks like the water line is slightly below the rim of the tank... could you have set it to be higher if you wanted? I'm a little surprised the overflow has a lower water level. guess I would've expected it to be pretty close to leveled off there, much closer to the emergency drain. Yes, it could be made higher. This depends on the height of the overflow box. I didn't want the water level so high that it would touch the bottom panes of the bracing, so gave myself a little room to spare. The level in the box (and overall noise) is controlled by the valve on the main drain line, the one on the far right.
Is your middle one the main intake? Do it and the right side one both have water flowing through them equally? Or does that middle one only get used if the water reaches up to the 1/4" tube and creates a siphon? The way I understood it from the original was that only one was in use, but watching it with water in it and seeing both submerged it makes me wonder. (Also, weren't his all on the same height? Your middle one is higher, right?) Main drain is the one on the right, open channel pipe is middle, emergency on left. The main drain on the right is the full siphon, which handles most of the flow. Full siphons handle a lot of flow and are silent, because no air is in the pipe. The middle pipe is 1/4" higher, and handling a small amount of spillover, because the main drain is partially closed off. This small amount of spillover clings to walls of the pipe, and quietly goes down to the sump. The middle drain will convert to a full siphon if and only if the water level reaches the 1/4" tube.
