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Thread: CYA for indoor hot tub?

  1. Back To Top    #1

    Join Date
    Apr 2015
    Suffolk, VA

    Question CYA for indoor hot tub?

    How important is CYA for an indoor spa, since there won't be loss of chlorine due to sun exposure? What if the hot tub is kept covered most of the time when not in use?
    33x18 Oval shaped AG pool, about 12,000ish gal
    1.5 Hayward Power-Flo LX pump
    Dream Line high rate sand filter
    Also 375 gal Baja 7 person spa w/cartridge filter

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

    Re: CYA for indoor hot tub?

    CYA is used at low levels indoors for a completely different reason that it is used outdoors.

    Indoors the crucial reason is that having zero CYA leaves the chlorine being fairly harsh. It can damage swimsuits and it also produces more disinfection byproducts than it does when you add CYA. CYA removes the harshness and lowers the occurrence of bad side effects (when used in moderation).
    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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