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Thread: Seem to have algae...

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    Seem to have algae...

    I've been using TFP for 2 years since we moved to our new house, but we just got an algae breakout. Not bad, but a definite green tinge to the water, especially noticeable in the deep end. I had been running my FC around 3.5-5 or so and my cc was always <0.5, if not 0.

    Anyway, we came back from a week with the cover left on and:
    1. Mixed up the Cl test and thought the FC was too high, so turned down the SWG clorinator.
    2. Somehow forgot to turn on the main drain after vacuuming, leaving just the skimmer for 2 days.
    3. FC fell to 2.5. I figured out what I was doing wrong with the FC test, restarted the main drain. 2 days later, green water. I'm surprised because the FC never went below 2 and the FC went to 1 last year for a couple of days with no breakout before I got it going again (neighbour accidentally turned off clorinator)
    pH 7.5 FC 5 / cc 0.5 / CYA 50 / TA 110 / CH 150
    4. Shocked up to 20 overnight and vacuumed pool. Guage went from 12 (usual) to 17, so backwashed.
    Tonight, pH 7.6 FC 10 / cc 0.5 / CYA 50 / TA 110 / CH 150
    5. Will Shock up to 20ish again. Hopefully pool will be OK for the weekend.

    (I'd been fighting with the pH to get it up all summer, now it's too high from the shocking with bleach)
    Oval pool, Aqua Rite SWG
    80000 l, 22000 Gal
    Vinyl liner, Sand filter, natural gas heater

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Seem to have algae...

    (I'd been fighting with the pH to get it up all summer, now it's too high from the shocking with bleach)
    pH of 7.6 is not too high. Chlorine has no affect on pH.

    Read "The ABC's of Pool Water Chemistry" up in Pool School to get a better understanding of the suggested levels.

    Read "SLAM - Shock Level And Maintain" in the How To section of Pool School if you want to clear your pool as quickly as possible. It's methodical process that will put you back in very good shape.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: Seem to have algae...

    PH will always check higher when your FC is over 10. Don't bother checking it while SLAMming the pool.
    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
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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