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Thread: what time should you test

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    Join Date
    Jun 2010
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    NW Foothills of North Carolina
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    what time should you test

    If you have a party at 5pm-7pm, then check chlorine values and add bleach immediately after people leave, then re-check about 2 hours later, should you have the same values in the morning? Or are the values going to be lower because it takes time for the water circulate to kill all the 'organic matter' throughout the pool?

    I added bleach after a party at 7:30pm. I tested water at 9:30pm (FC=17.5, CC=0.5). Checked water at 1:00pm the next day (FC=13).
    Nobody was in the pool after the party until 1:30pm the next day. It was cloudy until about 11am, then the sun came out.

    The pool passed the over-night loss test the day before.
    21K gallon, 16 x32 IG Vinyl, 3/4 HP Hayward Superpump,
    200 lbs Sand filter, Full sun all day

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    Mod Squad woodyp's Avatar
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    Re: what time should you test

    Why is your FC at 17.5 to begin with? Based on what?
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    Mod Squad Bama Rambler's Avatar
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    Re: what time should you test

    I test in the evening after the pump has been on for a while. I do it because it's easier for me and it gives me the lowest setting of the day. That way I make sure the FC stays above min.
    Dave J. TFP Moderator
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    JasonLion's Avatar
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    Re: what time should you test

    After a large pool party there is extra organic debris in the pool from all of the swimmers that takes at least several hours to all oxidize. Also, you would have lost FC during the morning, even if it was cloudy.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  5. Back To Top    #5

    Join Date
    Jun 2010
    Location
    NW Foothills of North Carolina
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    21

    Re: what time should you test

    The FC was so high because I had been fighting algae last weekend after my FC dropped to 3.5, plus we had some rain. So I had shocked the pool. Immediately after the party, the FC was 7.5 (it was 16 at 5:30am)

    We have a large number of swimmers almost everyday, plus my sister's dog likes the pool, so I can lose about 6-8+ ppm / day.
    21K gallon, 16 x32 IG Vinyl, 3/4 HP Hayward Superpump,
    200 lbs Sand filter, Full sun all day

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