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Thread: new tub, first fill tomorrow

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    Laenini's Avatar
    Join Date
    Aug 2008
    Brooklyn Center, MN

    new tub, first fill tomorrow

    quick question: I have been reading how to use chlorine in the new spa and I am wondering why do we use dichlor until cya levels are at target? Why not just use cya by itself right from the get go and use my favorite chlorox bleach right away then too?
    Pool: 24' round by 48" deep AGP
    Waterway 1HP-2 speed pump, H100 Heater, sand filter, skimmer, using BBB (love it!)
    Hot tub: 2008 CalSpas, 8x8, 8 seats, 60+ jets, ozonator
    3 step bromine sanitation

  2. Back To Top    #2

    Join Date
    Jan 2009
    Cupertino, CA

    Re: new tub, first fill tomorrow

    Because CYA typically comes in a 4-lb container, and in a typical spa you'd need only an ounce or two. In my spa, if I dump and refill 3x/year, a 4-lb tub would be enough for about 20 years. If you already have a tub of CYA lying around, go ahead, otherwise it's not worth it.
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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