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Thread: CYA level with SWG

  1. Back To Top    #1

    Join Date
    Jun 2015
    Stockholm, Sweden

    CYA level with SWG

    PoolSchool says CYA should be at 70-80 ppm with a SWG system, but the Zodiac manual recommends <50 and the Intex manual states 30 ppm. What is the rationale for keeping the CYA so much above recommended levels?
    Intex Ultra Frame 24'x12'x52" (732cm x 366cm) rectangular pool
    Intex SF80220RC (1600 GPH) pump/sandfilter
    Intex SF10220 (1050 GPH) pump/sandfilter driving the
    Intex Automatic Pool Cleaner
    Intex 8220 ECO SWG, Brilix XHP100 9kW heatpump

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: CYA level with SWG

    Because it better protects the FC from the sun and thus the SWG does not have to run as much to maintain adequate FC levels. As such, the SWG should last longer before needing to be replaced.

    Just make sure you maintain the FC level that is needed for your CYA level. See the FC/CYA Chart and Water Balance for SWGs

    These are good background if you have not seen them yet:
    ABCs of Water Chemistry
    Recommended Pool Chemicals
    How to Chlorinate Your Pool
    Jason, TFP Moderator
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