I need some plumbing/configuration advice please...

wrfreeman

Wade
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I've decide to convert my QT into a frag tank (with the ability to isolate it if I need to QT something) and pipe it into my main system. The QT currently sits in the basement below the DT next to my water mixing station. There's no room to add an additional tank upstairs. I currently have my chiller in the basement on a high shelf just under the floor and below the DT so plumbing through the floor already exists. The QT tank is a standard 20 gallon rectangular tank. I can place it on an elevated counter 4 or 5 high under the chiller. This would result in an additional 36 inch drop and rise of the current plumbing to the chiller. Since I changed over to LEDs I don't think the chiller ever comes anymore so I may remove it from the system but plumb in an option to put it back in. Also, with a tank in the basement, which I'm having to heat a bit, I don't think the chiller will be needed anymore. If anything, I may need to add a heater in the winter.


So my question is: how would you plumb in a tank that's downstairs? I'm thinking that I would need to move the return pump downstairs and have it either sitting in or next to the tank downstairs. Or would it be better to draw the water up from downstairs and leave the pump upstairs? Either way, that would lead to a total rise of about 3.1 meters to the top of the DT where the return flows back into the DT. I have an Eheim Universal 3400 that has a max 3.6 meter head. I've never measured what my flow rate is with the current set up, but I can say that it doesn't jet out of the return. It's a steady flow that starts to droop about an inch or so out of the pipe. Not sure if that means much. I'm concerned that adding another 3 foot to the rise and getting very close to max head would result in virtually no return flow to speak of even with removing the restriction caused by the chiller. I may need to upgrade the return pump to a pond pump. I currently use a Pondmaster Model 18 (1800 GPH) to pump the water from my mixing station to the DT upstairs. The flow rate on it to the sump which is about 3 feet below the top of the DT is approximately 216 GPH, but the pond pump sits on the basement floor so it has about a 15 foot rise, maybe more. Is there a target GPH flow rate to achieve the ideal water circulation in a sw tank?


So how would you handle this complicated mess? I believe it's doable. All suggestions and opinions are welcome as always:)
 
I'll answer a couple of your questions: It's better for the pump to be downstairs and push the water, not pull it. A return of 3 - 4 time water volume per hour is common. The rest of the water movement in the tank comes from closed loop or powerheads.
 
So if my tank is 72 gallons and the sump adds another 10 for a total water volume of approximately 82 gallons then ideally I'm looking for a return of 240 -320 GPH. If the pump is downstairs pushing up, then I'm assuming that the water will be gravity fed to the tank below and then pumped back up. No different then how the overflow works now except I would have to drill a hole for a bulkhead in the sump to allow the water to drain from the return section of the sump to the tank downstairs. The water would then be pumped back upstairs to the return pipe. That does that sound correct?
 
Here's what I'm thinking:
 

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That looks like a plan that will work. You'll have to have a pipe out of the sump that will definitely handle the flow out of the DT.
 
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Iit's piped to the sump with flexible tubing right now (1" maybe) so I'll just use the same size down to the lower tank. That'll mean a larger hole in the floor, but all that's hidden under the built in area so it's all good.
 
I think I'm going to have to scratch the whole idea. Too many opportunities for disaster. If the power fails, my upstairs sump will drain and flood the downstairs tank. If the drain line from the upstairs tank somehow becomes obstructed (snail, etc.), then the downstairs tank will pump dry and flood the upstairs sump. It's just not feasible. Thanks all for your help thinking through this.
 

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