I'm working out the plumbing for my sump / fuge. It is made from two 25G rubbermaid type tubs. They'll be attached with a couple of 1.5" pipes & uniseals.
I was planning on feeding the fuge from a tee off the return pump. But then I decided that I'd rather try to feed the fuge off the skimmer output. That means the water will be a little more "clean" than if it were coming of the return line, but I'm not sure if this will really be a problem since skimmers aren't 100% efficient anyway. It's not like the water will be purified. So that's my logic anyway...
I want to try to avoid feeding the fuge off the return pump because I will be running two or three penductors off that pump, so the pressure will be high, maybe 20' head pressure or so, and I want to put all of the available flow back into the tank. If it doesn't work the way I want, I may change it around, but that's the plan to start with.
Here are some pictures...
The main drain with the gate valve will allow me to balance the drain flow to the return pump flow. It will be adjusted so that the drain intake is fully submerged by several inches of water in the overflow area. That will create a completely silent drain into the sump. If something happens and it gets clogged, the water will rise in the overflow area until it overtops the "emergency drain" which will prevent a flood. Both drains are 1.5". IF the emergency drain ever kicks in, it will be obvious since the water level will be higher than normal in the overflow, and it will be loud too, so I'll know there is a problem. You can read more about this plumbing scheme and people using it successfully in this thread
http://reefcentral.com/forums/showthread.php?s=&threadid=344892
The skimmer is an AquaC EV180. It will be fed by a mag 9.5 which is a slightly oversize pump for this skimmer but I've read that it works well. I have a mag7 to use if the 9.5 turns out to be too much. The skimmer water level is controlled by a gate valve on the exit side. After the gate valve, the skimmer output splits between the sump and the fuge. Each branch has a ball valve. I think I'll only need to use one, but not sure which until I get things running and see how the water flows.
I haven't set up the sump return pump suction side yet. Hopefully I'll get that done this weekend also.
The bubble trap is (or will be when it's done) made from two somewhat large food storage containers that are made as a set that fits inside each other for storage. Both tank drains go into the bubble trap. This isn't really required for bubbles since the drain should not have any air coming down the pipe (it will be a full siphon) but the bubble trap does keep a fixed head height at the tail end of the drain which will help keep the drain system working correctly. The above linked thread about the silent drain method is really a great thread to read - anyone who wants to quiet their sump or eliminate bubbles from the drain line should check it out.
The skimmer return leg back to the sump also goes into the bubble trap, and the simmer feed pump is sitting in there as well. I wanted the skimmer feed pump inside the bubble trap since the tank drain is in there. I want to pull water right from the end of the drain line into the skimmer. I have the pump sitting in there so that it's intake is right below the end of the drain line.
Well that's about it for now ...