As Jon mentioned earlier, you can further control the water level in the box (to mitigate the waterfall sound) by raising the level of the secondary tube but the siphon in the primary tube gives you a pretty large tuning window regardless of the height of the secondary tube. If the water level isn't near the top of the primary tube (and I'm assuming not since it sounds like the hole still exists), you can raise the water level in the external box by closing the gate valve slightly. Should I plug the hole in the top of the primary u pipe and leave the secondary u pipe hole? And I still have a tiny bit of water going through my secondary drain. The main gurgling noise is gone but I now have a fair amount of noise coming from the waterfall between the inside the tank compartment,ent and the outside compartment. The secondary drain is down to a trickle when the primary gate is adjusted. Now the whole u pipe including the hole is barely underwater. So I went back in and shortened the primary drain pipe inside the overflow box by about 3/4 inch and then seated the u pipe lower. You'll have to make very minor changes to the gate valve over the next couple of weeks as pipe friction changes. Slowly close the siphon gate valve until the water level in the external box is above the siphon, and slowly entering the secondary plumbing. I split the difference between the top of the double elbow and the lip of the overflow box. But leave a little space between the top of the emergency pipe and the top lip of the external overflow box so that water doesn't spill onto the floor if there's ever a blockage to the primary siphon. The emergency has to be higher than the secondary. I set mine high enough to eliminate the waterfall effect as water flows from the internal box to the external box. The height of the secondary pipe defines the normal water level in the external overflow box. I left maybe an inch of space between the elbow's opening and the bottom of the overflow box so water can enter the elbow freely. Side 1 Full siphon Dry emergency Side 2 Trickle Tank return Doing it this way will keep both overflows balanced and water. It doesnt matter which side you pick but they need to be as follows. I set my siphon elbow as low as possible in the overflow box. One full siphon One trickle but able to go full siphon One dry With dual overflows theres only one way to setup a bean. I used a Ghost overflow at first before building my own overflow box.
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