Naka,
Thanks for your message. I really need to understand the CL system. I understand what I have now which seems like a closed loop to me-----drilled overflow to refugium and then the return back up to the overflow return stand pipes.
I am ordering a new tank and want to avoid usind sand and plenum with 2 maxijets like I have now. The idea is to run the plumbing for the overflow and the CL through the crawlspace to the garage 10 feet away --where I can have a sump, chiller, skimmer, etc. everything out there so I'll have more room for the top off RO water. I guess what I'm asking is the overflow/refugium circle like I have now one loop and then you do another one from the holes in the bottom of the tank(like yours) out to the garage and then back to the outlet holes in the bottom? How many do you use for the intake and returns? It looks like you have quite a few drilled in the bottom. Also, without sand (such as I have now with the plenum) how do you keep lifestock from getting sucked in by the flow of the outlet holes?
Thanks for having patience with someone who hasn't the knowledge of a CL design and the mechanics of how it works?
I want to order the tank within the next few days and I want to do it right this time.
Many thanks! You are kind to share your knowledge.
Gia