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What is your reasoning for wanting to know the flow of your syphon? I can’t help on your question but u can run a test to see what flow u have. In my case I have a 40 gallon sump that under normal operation runs with 25 gallons of water. So if I’m curious to know how many gph I am getting when I do a water change I fill my sump up to the rim which I know is a additional 15 gallons. Then I turn on the return pump & time how long it takes to get back to the normal water level & do the math to figure out the gph. In my case it takes right at 60 seconds to pump the extra 15 gallons of water from my sump. So doing the math it’s right around 900gph. I find it easier to figure how the gpm, then just multiply it by 60 to get the gph.
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