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Thread: recommended levels too high?

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    recommended levels too high?

    according to the Taylor brochure, recommended chlorine level is 2-4 ppm, and CYA is 30-50 ppm (APSP, NSPF guidelines). The levels posted in the Pool School are higher than this. Any idea why the discrepancy? I just don't want to bleach jewelry/swimsuites

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    PAGirl's Avatar
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    Re: recommended levels too high?

    Taylor doesn't account for the buffering properties of the CYA. I will look around for the exact explanation and share it with you.
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    Re: recommended levels too high?

    Actually, that is the exact explanation. TFP suggestions are from years of anecdotal evidence and solid science behind them. Most large companies don't keep up or consider the buffering affect of CYA......we do.

    If you stay withing the TFP guidelines, you and your swimsuits and pool will be perfectly safe.

    Please read "The ABC's of Pool Water Chemistry" up in Pool School
    Dave S.
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    Re: recommended levels too high?

    Chlorine should be about 7.5% of CYA, so at 30 CYA you would need 2.25 and at 50 CYA you would need 3.8. Those are minimum values. Their numbers are correct, but they don't account for high sun and UV or chlorine dropping due to pool use.

    TFP numbers are simply better, real-world values that work.
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    needsajet's Avatar
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    Re: recommended levels too high?

    Welcome to TFP! Good to have you here

    It's active chlorine that does the sanitizing. If you live in a city, the water coming out of your tap has more active chlorine than a swimming pool, because tap water has no CYA. In the pool, CYA binds the vast majority of free chlorine in an inactive form and releases it as the active chlorine is used up. This achieves three things:

    1. Protects the chlorine from extinction caused by ultraviolet light
    2. Maintains a reserve to cover variations in chlorine dosing, bather load and organic contamination brought into the pool by leaves and the like
    3. Reduces the "harsh" form of chlorine (the active chlorine, primarily hypochlorous acid)

    The pool industry has largely failed to recognize the mechanism and importance of this relationship for over 40 years. It's not new. Experts from here and elsewhere have lobbied for change with little success. TFP recommends methods that are safe and reliable, based on experience from 1000s of pools and backed up with sound science.

    If you want to dig deep, you can at this thread: Pool Water Chemistry

    If you follow TFPC recommendations, you'll have a safe, sparkly pool that won't turn green the day before a party. Your pool will never smell like a motel pool, and it will definitely not bleach your swimwear.
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

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    Re: recommended levels too high?

    Quote Originally Posted by needsajet View Post
    Welcome to TFP! Good to have you here

    It's active chlorine that does the sanitizing. If you live in a city, the water coming out of your tap has more active chlorine than a swimming pool, because tap water has no CYA. In the pool, CYA binds the vast majority of free chlorine in an inactive form and releases it as the active chlorine is used up. This achieves three things:

    1. Protects the chlorine from extinction caused by ultraviolet light
    2. Maintains a reserve to cover variations in chlorine dosing, bather load and organic contamination brought into the pool by leaves and the like
    3. Reduces the "harsh" form of chlorine (the active chlorine, primarily hypochlorous acid)

    The pool industry has largely failed to recognize the mechanism and importance of this relationship for over 40 years. It's not new. Experts from here and elsewhere have lobbied for change with little success. TFP recommends methods that are safe and reliable, based on experience from 1000s of pools and backed up with sound science.

    If you want to dig deep, you can at this thread: Pool Water Chemistry

    If you follow TFPC recommendations, you'll have a safe, sparkly pool that won't turn green the day before a party. Your pool will never smell like a motel pool, and it will definitely not bleach your swimwear.
    that makes sense. perhaps that's why I got Algae to begin with (FC=2.5 at CYA=60). Will keep it at 7 and see how it goes!

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    Re: recommended levels too high?

    Just stay above 4.5 (7.5%) and you will be fine. 7 Wont hurt.
    16 x 32 17500 gallons
    Vinyl in-ground
    Hayward 250# Sand Filter
    1 HP Pump
    Hayward SWG

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