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Thread: Algae on the pool cover

  1. Back To Top    #1

    Join Date
    May 2015
    Location
    Ten Mile, TN
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    74

    Algae on the pool cover

    I had quite a bit of algae on the pool winter cover remaining after pumping the excess water. I was carefully removing the cover a little at a time from both sides but not careful enough.

    I was pulling one side and the other side slid back into the pool and about 10% of the green gook spilled into the otherwise crystal clear water and now I have a cloudy light green yukky pool. ARGH.

    I quickly spiked to 11 ppm FC without any other analytical measurements....I'll get those after a few hours when the filter and FC have cleaned it up a bit

    Anything else I should be doing (other than following SLAM procedures) ? What happens to the algae in the sand filter- is it all backwashed out?
    24' Round 14000 gal AG - installed June 2, 2015
    Saltwater Hayward AquaRite w/TCell - 9
    Waterway 26" sand filter w/ 2HP 2 speed pump
    Taylor K-2006 FAS-DPD Test kit

  2. Back To Top    #2
    Richard320's Avatar
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    Jan 2010
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    San Dimas, CA (LA County)
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    18,768

    Re: Algae on the pool cover

    11 FC might not be enough.

    You own a decent test kit, so it's unlikely you let your CYA get out of control, but anything's possible. If your CYA is above 30, you need more FC.

    The green stuff will bleach to a greyish color and cloud the water until the filter strains it all out. Just be patient, don't go dumping a bunch of flocculent or clarifiers in. If you have any neighbors or friends with a DE filter, beg a bowlful of filter media and Add DE to a Sand Filter That filters finer stuff faster than just plain sand. On a microscopic scale, it's like setting window screen on top of chicken wire. If it works, you'll load up the filter in a hurry, so don't leave the filter running and disappear for the day. You'll want to keep an eye on the pressure gauge.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  3. Back To Top    #3
    Texas Splash's Avatar
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    Jun 2014
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    South-Central Texas, Marion/San Antonio
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    12,947

    Re: Algae on the pool cover

    You nailed it ... SLAM. Hopefully the circulation and higher SLAM FC level will neutralize anything spilled into the water quickly, unlike a normal SLAM where algae is already attached to everything. Still, do everything you see on the SLAM page to be safe. Backwashing will remove any of the dead algae as well. Just make sure to confirm pH first (7.2-7.5), and confirm CYA so you know what SLAM FC level to be at.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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  4. Back To Top    #4

    Join Date
    May 2015
    Location
    Ten Mile, TN
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    74

    Re: Algae on the pool cover

    Update

    I did a complete analytical and pH was 7.3, CYA was less than 30 and I've been seeing what Richard320 predicted....at first green, then grey, then cloudy. After a couple of days of FC=10 and a couple of backwashes the turbidity got better but still not crystal clear. Last night I did a FC overnight check and it went from 7 to 6 --- I just spiked it back up to 10. I've been trying to vacuum the pool from the outside (water temperature is only 68F) - and there are still a few leaves in there that keep eluding me

    I'll see if I can drum up some DE today.

    I don't have anything on hand to raise the pH so I'm leaving it at 7.3.
    24' Round 14000 gal AG - installed June 2, 2015
    Saltwater Hayward AquaRite w/TCell - 9
    Waterway 26" sand filter w/ 2HP 2 speed pump
    Taylor K-2006 FAS-DPD Test kit

  5. Back To Top    #5
    Mod Squad kimkats's Avatar
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    Jul 2012
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    Tallahassee, FL
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    26,692

    Re: Algae on the pool cover

    You can turn your returns up so they roll the water. That will push your PH up. Cheap and fun if you let them really have at it and make them like a fountain!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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