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Thread: pool/spa combo jet situation

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    pool/spa combo jet situation

    Hello,
    I have a pool/ spa combo where both the filter and spa jets are plumbed through the same 1 hp jet. I am having a problem of when I turn on the spa ( meaning , turn both jandy 3 ways to spa), the water is flowing, but there is not enough force to create actual jets and I cant hear any air being sucked though the system as it does when the jets are working correctly. So what I have been doing is turning off system, backwashing, and then the jets come out in force. This will work 1-3 spa sessions before I need to preform same procedure. I have no leaks, a clean filter, and this problem just started happining in last few months, any suggestions? Please help!!
    Thanks
    Mike
    ~20K gal, fiberglass/concrete hybrid Lazy "L", sand filter

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    JasonLion's Avatar
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    May 2007
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    Re: pool/spa combo jet situation

    Welcome to TFP!

    What kind of filter do you have (sand, DE, cartridge)?
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: pool/spa combo jet situation

    I have a purex trirton d.e. fns 60. I gave it complete filter cleaning last week.
    thanks
    ~20K gal, fiberglass/concrete hybrid Lazy "L", sand filter

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    Join Date
    Oct 2007
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    Valrico, FL
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    Re: pool/spa combo jet situation

    The one Hp pump maybe marginal. On my pool and spa I have a 1.5 Hp pump. So if you filter is slighlty dirty, or the sand compacts, the flow decreases slightly and not air is sucked in by the water. One possible solution is to try and increase the diameter of the spa jet fittings. You can try and remove them completely and see if it works.
    7,500 gal, IG pool, L shape 22' x 15', 1.5 hp pump, cartridge filter, AquaPlus SWG/Controller, Pebble-Tec liner.

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    Join Date
    Jun 2009
    Location
    Vero Beach, FL
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    Re: pool/spa combo jet situation

    Has this always been the case? It sounds like you are just on the edge with flow rate and any small amount of clogging of the filter causes it to slow too much. What is your pressure readings when it works vs when it does not work?
    25' x 13' Roman, 12000 gal IGP, Plaster, with 500 gal Spa
    SWG, 1 HP Max Flo Pump, C-900 cartridge filter
    Solar heat

  6. Back To Top    #6
    Guest

    Re: pool/spa combo jet situation

    This is a great example of where a "one pump chump" pool/spa combo is not the way to build a pool (I get upset at builders that still try and build this way ). This is not your fault, but the jet pump should always be a dedicated pump and the circulation pump should circulate clean water only. That way you do not have the back pressure from the filter working on the jets, and don't have to worry about diminished pressure.

    The "solution" to this type of system is typically a larger pump (check the flow rates on your jets versus the gpm on your pump. Allow for head loss.), which costs you more to run in normal circulation mode. Oftentimes pools are not plumbed properly for the larger pumps either, and the problem still exists.

    Using one pump to do it all is a cheap way to build a pool, and only serves one purpose: for the builder to cut corners! The homeowner pays for it in the end with higher electrical costs than they should have, air being drawn in and fighting heater efficiency when you are trying to heat the spa, and the inability to shut the bubbles off and just circulate/filter and heat the water quietly when desired.

    It does sound like you may have a plug in the system somewhere. Check the air line and see if something might be obstructing it or being sucked in partially when you go to spa mode. Good luck (and sorry for the rant!).

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    JasonLion's Avatar
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    Re: pool/spa combo jet situation

    In addition to what everyone else said, I can think of two other possibilities. If your plaster is brand new, plaster dust could easily be clogging the filter very quickly. This is common with fresh plaster, and will ease up after three to four weeks. You could also get these symptoms if you added too much DE. This could happen either on the initial loading of DE or after backwashing. After backwashing the filter usually only needs about 80% of the DE you put in the first time.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Join Date
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    Re: pool/spa combo jet situation

    Try setting the MPV to recirculate. That will remove the filter tank from the equation. If life was good before the replaster and now it isn't, I wouldn't be surprised if the nozzles of the jets were clogged or the drain was partially.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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