thank you for taking under consideration this issue, but the answer you gave me is not sufficient.
I need two sensors summing the entering flow from two pipes, to the exact amount of water for the exit pump.
this issue is taking place in an aquarium that is a living organism. some things such as algee, see weed, broken corals, or even fish could maybe interfere with the overflow system, so the idea you are thinking of couldn't end into bad situations.
I have given a lot of thought for this issue and I ended in this idea of the two sensors, because I find that this would be the safest way to control the flow of the return pump.
one hint for this issue is that the exit pump has to be able to give the exact flow that the water returns!! and to be sure we measuring and summarizing the 2 overflow sensors with the third flow sensor of the return pump!!!
i have drawn a sketch so you can have an idea of what i am thinking of and sent it as an attatchment.
controller.png
please give this issue a second thought, with no time pressure...
i will be waiting for your response.
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