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Thread: Ok to leave the system in AUTO when there is no flow?

  1. Back To Top    #1

    Join Date
    Jul 2012
    Austin, TX

    Ok to leave the system in AUTO when there is no flow?

    Hi all,

    I have a Hayward salt water chlorine system. My pump has an internal timer, so it does not use the external timer and it is always on. The salt system connects to the same load, so it is also always on. My pump does not run at night. Is it a problem for the salt system to stay in AUTO when there is no flow?


    Lazy-L shaped pool and a spa. 22.5k gallons. Pentair VS pump. Pentair cartridge filter CCP520. STA-Rite SR400NA heater (400K BTU). Leuder limestone coping. Pebble sheen (blue granite) Wooden deck.

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Ok to leave the system in AUTO when there is no flow?

    In the short run that is fine. But you shouldn't leave it that way long term. If the flow sensor in the SWG ever fails, and they do tend to fail eventually, there could be an explosion hazard. It is always best to have something additional that shuts down the SWG when the pump is not running.

    One way to do that is to get a current controlled relay to turn the SWG off when the main pump is not running. Another approach is to get a separate timer that turns the SWG off, though if you do that you need to take care that the two timers remain in sync.
    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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