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Thread: Plumbing question....is a siphon created when input doesn't equal output?

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    Plumbing question....is a siphon created when input doesn't equal output?

    On an equipment pad that is higher than the pool body....

    If water volume on the supply side exceeds water volume on the return side, will the supply side drain backwards to the pool (more water weight)? I have 2 x 2" pipes on supply side and 1 x 2" pipe on return side.

    I'm guessing it wouldn't if the returns are submerged (closed loop would only suck more water into the pipe). But what about water features that return above water (deck jets, water slide)?

    I know a check valve would eliminate this so I guess it's more in theory.
    18'x36' vinyl - 24k gal - Intelliflo 3hp VSP - Pentair C&C 420 cartridge filter - IC40 Salt - EasyTouch 8 - ScreenLogic - Raypak 406btu NG heater - Intellibrite 5G ligths - 4 deck jets - sheer descent - X-Stream Slide 2 - TF100 kit - opened spring 2017

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    Re: Plumbing question....is a siphon created when input doesn't equal output?

    A properly sealed suction side won't drain back in. Return sides often drain back depending on how constructed.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

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    Re: Plumbing question....is a siphon created when input doesn't equal output?

    How can the return side drain back in without pulling from the suction side? How would air get into the system?
    18'x36' vinyl - 24k gal - Intelliflo 3hp VSP - Pentair C&C 420 cartridge filter - IC40 Salt - EasyTouch 8 - ScreenLogic - Raypak 406btu NG heater - Intellibrite 5G ligths - 4 deck jets - sheer descent - X-Stream Slide 2 - TF100 kit - opened spring 2017

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    Re: Plumbing question....is a siphon created when input doesn't equal output?

    Vacuum release valves in a solar system, open waterfalls or the like. Water generally won't run through the stopped pump or the filter.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

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