![]() What he describes in his write up (and what lines up with my very limited experience) is that a single pipe system can't be as silent AND as consistent as this system because 100% of the flow plus the oxygen have to make it down the same pipe. I think the main points here are that you have one pipe that runs at a full siphon and a second just trickles down. When you hear water tricking through it, you know you need to open up the valve on the main drain line to let the "plug/debris" pass through. This is in case something plugs up your main drain line. The other (second) drain line is near the top of your tank is a backup drain line that has NO valve on it. This is dead silent, but it's still skimming the water's surface because the water line in your overflow is only about halfway or 2/3 full. In other words, you are tightening the valve on your drain line so that your pump's output is matched almost exactly by your drain line's water flow. As you tighten it up, the water in your overflow chamber will start to raise up a few inches over the top of your main drain pipe. You use the gate valve to CAREFULLY tighten up on the water flow going through the main drain line. Inside the overflow chamber, this drain pipe only goes up about halfway up. The main drain will have a very good quality gate valve (NOT cheap ball valve) on the end of it where it goes into your sump. One main drain line, one backup drain line. ![]() Honestly I think there is a more simple way of doing it, as long as you do have an overflow chamber in your tank.
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