<a href=showthread.php?s=&postid=6474895#post6474895 target=_blank>Originally posted</a> by Travis
Congrats on getting the tank moved in.:celeb1::celeb2::celeb3:
I thought about your oveflow drain a little and you can tee it off for the skimmer and safely restrict the drain. Here is what you will need to do:
Let's pretend your drain line goes straight down to your sump under the tank so it is just a 2" pipe that goes straight down. I know this isn't the case but it will help me explain it better. At the bottom of the drain you have your ball valve that will help back up the water in the drain so that it goes out the tee to the skimmer. Above where that ball valve is, you have your tee to your skimmer. Now several inches above that tee for the skimmer you add another tee. This tee is your emergency drain tee. From this tee you just put a 90 degree elbow and a straight length of PVC down to the sump. Under normal circumstances you will have everything set so you get a constant flow rate going to your skimmer and a constant flow rate coming out the drain into the sump. But if something happens and you get a restriction to the drain or if you clean your return pump and it starts pushing more flow, then the water in the drain pipe backs up to the emergence drain tee and exits out that and into the sump.
This may sound a bit confusing but it will work and it will work safely. If you don't quite follow me, I can draw up a diagram to show you what I'm getting at.