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Thread: Algae coming back after shock. Stressed!

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    Join Date
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    Baltimore, MD
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    Algae coming back after shock. Stressed!

    Hello all,
    Just uncovered my pool this week and it was pretty well green. After some bad advice and a few lessons learned I came to you guys to get me straight.

    I thought I won the war on algae but noticed it's creeping back.
    I've been testing my water daily and yesterdays numbers were

    FC 1-2
    TA 80
    CYA 18
    PH 7.5
    CH 130

    I should note that my shock FC was 12 and that was using liquid bleach on Wed.
    Today I added 2 more gallons of bleach brining my FC number up to 6.
    Talk to me, what do I need to do to rid myself of this for good? Higher FC levels over a longer period of time?


    What I'm seeing.
    1988 installed, 45,500 Gal, IG, Gunite w/spa
    60 sqft DE Filter, Pentair WhisperFlo 2 HP WF-28 pump, "Shasta" infloor cleaner.

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    Rochester, NY
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    Re: Algae coming back after shock. Stressed!

    What are you using to test? Do you have a recommended test kit?
    Rick
    Installed June 2012 Aqua Leader 24ft Round AG Influence w/54 inch walls 13,500 gallons
    Cartridge Filter 100SF, 1.5HP
    Aqua Plus Smarte System - In for vacations, BBB all the way.
    Love my PVC Solar Cover Hangers

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    Re: Algae coming back after shock. Stressed!

    The big TF 100 kit.
    1988 installed, 45,500 Gal, IG, Gunite w/spa
    60 sqft DE Filter, Pentair WhisperFlo 2 HP WF-28 pump, "Shasta" infloor cleaner.

  4. Back To Top    #4

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    Jun 2012
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    Re: Algae coming back after shock. Stressed!

    Quote Originally Posted by BauerR View Post
    The big TF 100 kit.
    Excellent.

    Is your CYA really 18?
    What is your CC?

    I'd go ahead and SLAM. I'd also consider raising your CYA up to 30-40 to help hold the chlorine. At least after you pass the OCLT.
    Rick
    Installed June 2012 Aqua Leader 24ft Round AG Influence w/54 inch walls 13,500 gallons
    Cartridge Filter 100SF, 1.5HP
    Aqua Plus Smarte System - In for vacations, BBB all the way.
    Love my PVC Solar Cover Hangers

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    bridgman's Avatar
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    Bowmanville, ON Canada
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    Re: Algae coming back after shock. Stressed!

    Sounds like you need to SLAM (Shock Level And Maintain)...
    Cedar hot tub, 680 US gallons - Snorkel wood-burning heater, canoe paddle, "offline" Intex 1000 GPH pump/filter with skimmer

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    Donldson's Avatar
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    Re: Algae coming back after shock. Stressed!

    If your CYA is really 18 (the test doesn't go that low...) then your chlorine is burning off in the sunlight. Raising it to 30-40 will help you lose less during the day. After that a full SLAM will remove the algae and keeping FC within the proper range for your new CYA level will keep it from coming back.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
    Pool School - PoolMath - HIGHLY Recommended Test Kits

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    Houston, Texas
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    Re: Algae coming back after shock. Stressed!

    Is the picture of an area of poor circulation?

    Even though yours is green, I get a small amount of black algae at the water line along one side of my pool (along the tanning ledge) that gets poor circulation. Frequent brushing helps.
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

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    Richard320's Avatar
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    San Dimas, CA (LA County)
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    Re: Algae coming back after shock. Stressed!

    Did you "shock" the pool, or did you SLAM? SLAM = Shock Level And Maintain.

    How many days did you have to keep the FC up to shock level to eradicate everything and pass the overnight loss test?
    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!

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