Hole location for closed loop

[dow]

Well, after further research, I've determined that the new tank is going to need a closed loop. My sump just won't be able to handle 1200 gph of flow. Now for the question. Where should I put the drain hole for the closed loop. or does it matter?


Attached is a diagram of the tank, in case it makes a difference.

[JeffCo]

I agree, right in the middle back about halfway down. This way you can still reach it fairly easily from the top.

[NaCl_H2O]

If your Calfo can handle the flow, consider putting it behind the Calfo. This way you dont have any screens in your tank. Otherwise higher is probably better, just in case the bulkhead leaks.

[::pete::]

Nice diagrams Dow!

I'd drill the closed loop intake smack dab in the middle/back of the aquarium.

In the middle, but high unless you have enough "free volume" in case there is an outage.

[captexas]

As it's a closed loop, the "free volume" doesn't matter as there is no place else for the water to go if the power goes out.

[::pete::]

I guess you have a point there !!! :wacko

[dan]

you can't put them behide the calfo. then it's not a close loop. in and out have to be all under water. a closed loop also runs on it's own pump. if power goes out, water has no place to go and stays in the closed loop. BTW you can't split that pump to run both the filter and the close loop. you said you had 1200 water flow now. your going to have to use that pump for the close loop and buy another pump for the filter if you don't want to run that much water through your filter

[dow]

BTW you can't split that pump to run both the filter and the close loop. you said you had 1200 water flow now. your going to have to use that pump for the close loop and buy another pump for the filter if you don't want to run that much water through your filter

Actually, that's what I was going to have with the mag 18 in the sump. Currently, I'm running about 400 or so from the sump, and about 600 in the tank via maxi-jet 1200's. I'm shooting for 300-400 from the sump in the new setup, along with about 1200 or so through the closed loop in the new tank. Current tank is a 45 breeder.

[dan]

along with about 1200 or so through the closed loop in the new tank. Current tank is a 45 breeder.

is this 1200 or so a seprate pump?

I'm running about 400 or so from the sump

and is this another pump?

[dow]

along with about 1200 or so through the closed loop in the new tank. Current tank is a 45 breeder.

is this 1200 or so a seprate pump?

I'm running about 400 or so from the sump

and is this another pump?

Original pump that I'm using now is a CAP-1800. This pump will continue to be used for moving water from the sump to the main tank. I've had it from the get go. I'm putting a mag-1800 on for the closed loop.

[NaCl_H2O]

you can't put them behide the calfo. then it's not a close loop.

Dan, why couldn't you put the inlet for the closed loop behind the Calfo <_< I guess if the sump pump stopped, the closed loop inlet could go dry, but is there any other reason? Sometimes I wish I had gone this route with mine :unsure

[dow]

I think that Dan's concern is that if you put it in the overflow box, that it might pull air through the lines, thereby making your tank int a saltwater jacuzzi.

[dan]

not only that but your closed loop pump might might pull more water than the water going into the calfo. now you have a pump that try to push all the water into the tank and nothing going to the filter. got a mop??? :o

[GaryP]

Just remember when you are building this that the idea behind a calfo is to have very little disturbance of the water surface with your returns. The theory behind a calfo is let the oily waste products accumulate at the surface and be removed by the overflow. Any turbulence at the surface would be counter productive for a Calfo. You basically want a concentrated waste product going to the sump.