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if running a closed loop system with, lets say an 8000lph pump do you say you have 16000 lph as the intake should have as much flow as the output or keep it at 8000 as thats what the pump is rated?

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''All the clown fish and yellow tangs in the world cant save you now!''

You have officially confused me with that run-on sentence. I think you are trying to ask if your overflow should be rated greater than your pump. Yes, is the answer.

-Josh

basically

your running a closed loop

the pump is rated at 8000 lph

8000l goes into the pump an hour

8000l goes out the pump an hour

do you say you have 16000lph on your tank?

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''All the clown fish and yellow tangs in the world cant save you now!''

do you say you have 16000lph on your tank? NO, you have 8000lph



Ok, this whole setup sounds like a disaster waiting to happen(if I understand the situation).


1. Are you pumping from your tank into a sump below it?

2. If so then why not just hook up an over flow box instead?

But question 2 aside for now, if the thing you are pumping into is not level with the tank you must take height into consideration as it affects flow rate. The one pumping up has to be slightly larger than the on siphoning to make up for the affect of gravity on the water going up hill, you would still need to install ball valves so you could tweak the flow to get it just right.

A picture, even a bad one, would help clarify what you are talking about though as I am very about what exactly you are doing here.

its not a real tank
i was just asking how to caculate flow when running a closed loop

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''All the clown fish and yellow tangs in the world cant save you now!''

To actually calculate your flow you would have to consider head loss due to the height and length your pump has to pump, and how many 90* angles that are in you plumbing. So your actual lph will be much less than 8000.

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Critical Fertilator: The Micromanager of Macronutrients