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Thread: Is this algae?

  1. Back To Top    #1

    Join Date
    Jul 2010
    Location
    Raleigh, NC
    Posts
    60

    Is this algae?

    See pic below - is this algae?

    Test results are
    FC 1.5
    TA 80-90
    CYA 40
    pH 7.8

    I've read slam article in pool school & I have 1000 oz of 8.75% bleach on hand.
    How important is it to bring pH down to 7.5 before I slam?

    THANKS
    26' x 52" Intex Ultra Frame (14,667 gallons), Hayward Matrix 1hp 2speed, Hayward ProSeries 21" sand filter
    1.5" PVC piping with in-wall skimmer, TF100 test kit
    City water in Raleigh, NC

  2. Back To Top    #2
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758
    It looks like it to me.

    Your FC level is too low for your CYA level thus the algae. Your FC level should be 4-7 ppm for your CYA level and not below 4.

    SLAM it. Try to get your PH down to 7.2 before you SLAM.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  3. Back To Top    #3

    Join Date
    Jul 2010
    Location
    Raleigh, NC
    Posts
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    How long to wait?

    Merged by moderator. Please keep your related questions together. Thanks, jblizzle

    Think I have algae. pH is a little high - 7.8 - so I just added some acid. Pump is on high. How long do I have to wait to test pH again? Only have about 30 mins before bed, at which time pump goes to Low. Am I better to wait til morning to SLAM ?

    Other results - FC 1.5, TA 80, CYA 40
    26' x 52" Intex Ultra Frame (14,667 gallons), Hayward Matrix 1hp 2speed, Hayward ProSeries 21" sand filter
    1.5" PVC piping with in-wall skimmer, TF100 test kit
    City water in Raleigh, NC

  4. Back To Top    #4
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758
    30 -60 min should be good.

    Keep everything under the first thread you started. It's easier for everybody to follow. You can wait to start SLAM tomorrow.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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