How to throttle down a fixed gph external pump?

  • We are currently upgrading MFK. thanks! -neo
F

feralhuman

Feeder Fish
MFK Member
Apr 10, 2015
41
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6
United States
I have found a pump that is more than adequate for my purposes. I might be having marsh fish sometimes, creek fish at other times. They need completely different flow rates. I'm trying to figure out how to force this pump to do what I want. My first idea is to add a line to the pump output with a valve. The idea would be that when I open the valve on the second line some of the water is fed back into the last section of the sump where it just came from. The more water that goes back into the sump, the less goes up to the fish tank. I don't want to choke the pump for fear of taxing it and damaging it, maybe there is no reason to be concerned about this, I don't know. If there is no reason to be concerned I could just install an inline valve and be done with it. But I really don't want to damage my pump.

Thoughts?
 
I'd tee it off and refeed some of the water back to the sump. Throttling back a pump with a ball valve puts extra pressure on the impeller and can cause excessive vibration and wear.

The nice thing about refeeding the water to the sump is that it's perfect for running a Uv Sterilizer or a wetdry filter or something too

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Another option is that you buy a jebao dc pump that allows to adjust the the flow with a button.
I recently bought a dc2000 which can pump up to 2000 liters per hours at max ofcourse and a standard built in feed mode button.
Check it

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Gate valve on return line to tank increases pressure on seals and fittings for greater potential of leaks. Better to simply route some back to the sump without increase of system pressure.
 
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