Originally Posted by matthew_raw
Hello, using two external filters could i run a sump without an overflow. I was thinking of putting the intake from filter number 1 in the display tank and the output of filter 1 in the sump. The water is then filtered through the sump, the intake of filter 2 picks the water up and returns it to the display tank through its outputs.
The 2 filters i have are exactly the same and if there is any difference in flow i can allways use the valves to slow one down.
Would this be worth doing? Thanks in advance
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you would have to make certain that the intake is placed so that in the event of a power failure, the tank doesn't drain, hence the use of overflows.
The idea of using two pumps, one feeding and one returning, really isn't that sound of an idea because if any difference between the two develops, you can end up with a flooded display or flooded sump.
Something as simple as partial blockage of the intake would be enough to cause issues. So a snail or other critter could potentially cause a flood in the middle of the night.
Generally you want to use gravity to get water from the display to the sump, not a pump.
Using one canister to move water out of the sump would be safer and you could use the second for additional biological/chemical filtration.