Far as the noise, guess it depends on the pump. Have seen it work big time on some, not so much on other. Know it can’t hurt.
Venturi effect is when water is rushing by the tee where chiller returns to return line, it creates s vacuum. Most skimmer pumps pull air into skimmer in this, venturi way. Not necessarily a bad thing, unless it pulls a lot faster than the pump pushing it through the chiller on the other side can’t keep up. Then that pump gets “dragged”, and could make noise, and won’t be good for it’s lifespan. Just don’t see why you wouldn’t just return chiller to section that houses return pump. Would also eliminate the chiller pump, since you’re doing a manifold.
Well really, would keep the return pump for tank separate. So you have a better idea of what your gph is making it to tank. But that’s not what you were asking, and many people have very successful tanks with the return on a manifold
Great explanation on Venturi...I think that is what is causing a whistling sound that happens every so often in my tank. It sounds like a ghost! Lol. I had started another thread a few months ago trying to figure it out and thought it was the pipes inside the overflow, but then it started again after I had made some adjustments that I thought had corrected the problem. I will be getting rid of that T tomorrow, actually, later today!
So you are thinking I should just keep my return pump and then have a separate manifold for all the other equipment? So would I then add a second return to run the manifold? What would be the advantage to this if I am understanding it right?