Originally Posted by
snookedsteve
Just a quick question. When you guys refer to closed loop what are you talking about. Might be a silly question.
CLS removes the powerhead from the tank and places it externally (via external pump) and cycles the water for flow. It's called closed-loop because the system is sealed meaning no sump/refugium that would add a break in the plumbing. In a basic CLS you have the intake, plumbing, pump, plumbing and returns and that's all. (Of course you can add other equipment if you want such as canister filters, uv sterilizer, SCWD (wavemaker), etc. but not necessary). Customize to your specific needs.
Here's a picture of one:
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Again, there's no one way to set up a CLS which makes it that much more fun to make yourself. Experiment a little. Hope this helps.