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Thread: Help me understand spa plumbing.

  1. Back To Top    #1

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    Help me understand spa plumbing.

    With a little luck I'll be in gunite by next weekend.

    Since I'm owner/builder this pool, I want to make sure I have a keen understanding of the plumbing of the 18" elevated spa with a wide spill over.
    I'm going to be using a single pump (pentair 3050VS).
    Following this drawing, it appears the returns for the make-up and the jets are the same:
    [attachment=1:3gv237aq]Pool_Spa_Plumbing.jpg[/attachment:3gv237aq]

    But looking at builds on this forum I see spa with extra returns, like this:
    [attachment=0:3gv237aq]plumb1.jpg[/attachment:3gv237aq]

    In that pic I see lines for the water and air for the jets, lines for the spa drains and another at knee level.
    Is this because there is a separate pump for the jet returns? Or is there another reason?

    TIA
    Dave
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    Re: Help me understand spa plumbing.

    The extra plumbing loop around the spa is for an air blower. It pushes air that mixes with water at the "T" fittings. Besides the air being introduced, the blower adds significantly more pressure to the jets.
    In the industry, CSP (Certified Service Professional) by the NSPI and it's successor the APSP. My company services over 600 pools every year. I think the practices regularly espoused on this forum (especially the BBB method) are outstanding; however my comments will be often oriented towards the goal of getting it done, and getting it done right now!

  3. Back To Top    #3

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    Re: Help me understand spa plumbing.

    I know it's hard to see but it appears there are four lines in that spa pic.

    Blower air
    Spa jet
    Spa drain
    ?????

    My question is why the fourth. It looks like a water return and isolated.

    Here's another one from a TFP thread



    I see the drain, jet, air (not finished) and another 2" line with a tee at the end. Why?
    Pool is DONE!
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    Pentair Easy Touch 8 + actuators + swg
    Pentair IntelliPH
    Pentair 400btu HD heater
    3- Jandy WaterColor LED's
    Hayward C5030 525sqft cartridge filter
    Waterway spa blower

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    Re: Help me understand spa plumbing.

    I suspect that that extra line is the spa bypass. There to keep the spa water fresh, and have the spa overflow on all the time. Slightly different from your original diagram, which controls the spa bypass with a valve (the way I would do it).
    In the industry, CSP (Certified Service Professional) by the NSPI and it's successor the APSP. My company services over 600 pools every year. I think the practices regularly espoused on this forum (especially the BBB method) are outstanding; however my comments will be often oriented towards the goal of getting it done, and getting it done right now!

  5. Back To Top    #5

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    Re: Help me understand spa plumbing.

    So a separate line to the spa is called a "bypass"?

    I just need another valve, check valve and piping (of course).

    At the pad, could I not just tie this in after the pool returns?

    Thanks.
    Dave
    Pool is DONE!
    Pentair Intelliflo VS3050
    Pentair Easy Touch 8 + actuators + swg
    Pentair IntelliPH
    Pentair 400btu HD heater
    3- Jandy WaterColor LED's
    Hayward C5030 525sqft cartridge filter
    Waterway spa blower

  6. Back To Top    #6
    JasonLion's Avatar
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    Re: Help me understand spa plumbing.

    I call the extra line a spa return, distinct from the spa jets. In a single pump system it is rare, but when there it is used so you can run the spillover or heat the spa without running the jets. It requires another three way on the spa return line.

    That same return line is used differently, and is required, when using a separate jet pump. The regular return line comes from the heater, which is on the pool/spa shared circuit, while the jets would then be on a separate jets only circuit.
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