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Thread: How to determine the strength of your bleach?

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    Her pool boy's Avatar
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    How to determine the strength of your bleach?

    Hi. Have a bit of a head scratcher. I added enough bleach last night, according to pool math to raise my FC by 2. But It only ended up raising the FC by 1. My FC was 2 and 90 minutes after adding it measured 3. I measured again this morning and got 3. I know bleach loses strength over time, I am just wondering if there is a way to measure the strength of the bleach.

    I am am also pondering whether whenI measure 3 last night The chlorine hadn't mixed completely, and it got to 4 overnight and lost 1 FC before I measure this morning but don't think that is likely because I haven't been losing 1 FC over night.

    i suspect bleach strength but don't want to assume anything, then over chlorinate. Is there a way to test? that is the question..

    Readings this morning are

    FC 3
    CC 0
    pH 7.6
    TA 100
    CH 150
    CYA 35
    SteveS

    16' x 50' - 95K L (25000 gallon) I.G. Vinyl liner 12.5 Liquid Chlorine
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    Mr Bruce's Avatar
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    Re: How to determine the strength of your bleach?

    I did a bathtub test one time. Seemed to work pretty well. I used the bath tub and pool math to calculate bleach strength
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
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    Mod Squad woodyp's Avatar
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    Re: How to determine the strength of your bleach?

    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
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    Mod Squad JVTrain's Avatar
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    Re: How to determine the strength of your bleach?

    Two options.

    See the directions in this post: Commercial bleach: testing concentration

    Or... Taylor has a test kit to test the strength of bleach. Welcome to Taylor Technologies Not sure its worth $100 to you though.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Her pool boy's Avatar
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    Re: How to determine the strength of your bleach?

    The reading links were very helpful, I think I like the chem geek's method, and based on that my bleach is currently at half strength.
    SteveS

    16' x 50' - 95K L (25000 gallon) I.G. Vinyl liner 12.5 Liquid Chlorine
    Wicor Pantera P24 Sand Filter Pentair Superflo Variable Speed Pump
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    phenol red's Avatar
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    Re: How to determine the strength of your bleach?

    Keep in mind that bleach decomposition rates can be predicted:

    Breakdown of bleach over time by storage temperature - Page 2
    30k gal in-ground, vinyl liner, Hayward 300 ft2 cartridge filter, 1 hp pump, Hayward 250k btu natural gas heater

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    Her pool boy's Avatar
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    Re: How to determine the strength of your bleach?

    Thanks red...it now all makes perfect sense.
    SteveS

    16' x 50' - 95K L (25000 gallon) I.G. Vinyl liner 12.5 Liquid Chlorine
    Wicor Pantera P24 Sand Filter Pentair Superflo Variable Speed Pump
    Zodiac 3510WD Robotic Cleaner Raypak R336A Heater. ​Taylor K2006c test kit

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