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Thread: Need to close but have major algae. Clear it up first?

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    Join Date
    Jun 2007
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    North Carolina
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    Need to close but have major algae. Clear it up first?

    So, we've neglected our pool since it's gotten cooler. Our winter cover had to be tossed because quite frankly, it was a piece of junk. So, we're ordering a new cover and need to close. My once beautiful pool water is now looking like pea soup. I thought about keeping it green through halloween, dressing up like a witch, tossing a bunch of dry ice into it and pretending it was my giant cauldron.

    I put 15...yes 15 jugs of bleach in it 2 days ago and it didn't do squat. My CYA is 70 (too high for my liking...I try to keep it below 50) and I'm showing no CC or FC. I didn't bother testing the PH and all since we're going to close it.

    Do I even bother clearing up the pool before closing or just wait until next season and clear it up during opening? I'm mad that 15 jugs didn't do anything. The algae is REALLY bad though. I've scrubbed, vacuumed, backwashed....continuously. I don't want to spend the money on bleach if it would be better to just cover it green and wait until late spring.
    27' ABG
    Sand Filter

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    benavidescj's Avatar
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    Apr 2010
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    Fleming Island, FL
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    431

    Re: Need to close but have major algae. Clear it up first?

    Well, the algae should not be a problem. But if you let the other chemicals go and your Calcite index is higher that .6 you could be damaging the liner, I think. Some of the experts should be around soon to confirm this.

    This is just me, but I would not want to close with a swamp. I am anal about my pool and just would not like it.
    Carlos
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

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    benavidescj's Avatar
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    Fleming Island, FL
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    Re: Need to close but have major algae. Clear it up first?

    By the way, the 15 jugs of bleach you put in the pool. I did some calculations and I don't think that you even got to shock level for your size pool and the amount of CYA you had, assuming you are using 96 oz jugs. Even I you did get up to shock level, the amount of algae you say you have would have easily eaten up what you put in and laughed at you. Shocking is a process that requires vigilance. You have to get to the shock level for your pool size and CYA then maintain that FC level over time. You can't just add some bleach and walk away, it won't get rid of it.
    Carlos
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

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    Join Date
    Mar 2007
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    San Rafael, CA USA
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    12,082

    Re: Need to close but have major algae. Clear it up first?

    If this 27' above-ground round pool is 4' deep (48"), then that's around 17,000 gallons. 15 jugs (96 ounces each) of 6% bleach would raise the FC by around 40 ppm. Was the bleach an off-brand regular which might have been weaker (possibly < 3%)? Usually only off-brand Ultra or Clorox Regular are 6%.

    If you aren't going to be maintaining the chlorine level in the pool and want to prevent algae growth in the future, then you can use other products at extra cost as insurance. Using 50 ppm Borates would likely take the edge off of such growth as would weekly PolyQuat 60 algicide or even (gulp) a phosphate remover or copper algicide though those the latter two have their own problems/issues. It's much easier to prevent algae than to fight an existing bloom.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Join Date
    Jun 2007
    Location
    North Carolina
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    Re: Need to close but have major algae. Clear it up first?

    The bleach was the Ultra from Aldi's.

    I'm going to buy more bleach and spend the weekend treating it the way I should.
    27' ABG
    Sand Filter

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