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Thread: Question about correct Alkalinity numbers?

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    Seanhan's Avatar
    Join Date
    Mar 2013
    Fort Worth Texas

    Question about correct Alkalinity numbers?

    TF-100 instruction card says Alkalnity for SWG should be .. 70-90

    Pool School says...60-80. ( SWG, Fiberglass )

    Iam at 90 ...

    Why is there a difference and whtch one should i use ??

    Sean Hannon
    30,000 Gallons gunite pool Coated by Fibertech
    Hayward Pro Grid 72 / Hayward multiport
    Circupool V3 VS pump
    CirCupool SWG RJ 60, 400.000 btu raypak , Built in SPA

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    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Re: Question about correct Alkalinity numbers?

    Not sure why there is a difference but 60-90 is acceptable. Having TA higher than those levels simply causes the PH to drift up because the SWG is a source of aeration. Aeration combined with high TA cause PH drift. So simply lower the PH to 7.2 anytime it drifts up to 7.8, and eventually the acid lowers the TA into range as well, and you won't see the PH drift anymore or as often.

    In other words, your fine.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
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    thehowheels's Avatar
    Join Date
    Apr 2013

    Re: Question about correct Alkalinity numbers?

    The section on TA I found from the explains that TA is calculated differently if you have a SWG:

    If you have a SWG, or if you commonly run water features such as a spa, waterfall, or fountain, keep TA on the low side, between 60 and 80. Otherwise levels between 70 and 90 are good.
    9k gallon, plaster, IG. Raised spa w/ spillover into pool. AO Smith Century Centurion / Purex Triton WisperFlo 0.5 HP, Hayward 1.5 HP (spa), Polaris 1-516-01 1.5 HP (blower). Hayward DE3620 36 ft2 72 GPM DE Filter, Polaris 145 cleaner. Pool built ~1980.
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