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Thread: New pool owner - just found a huge algae bloom

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    New pool owner - just found a huge algae bloom

    Hi TFP'ers! First off, thanks so much for the wealth of information on this site. I went from understanding nothing to having a pretty good idea on how to manage things on my own in a week! I'm a first time pool owner, rennovating a house that was vacant for > 6 months. The pool was eating chlorine like mad despite being relatively clear, then over the weekend I noticed some algae forming on the steps, I knew I had a problem. Luckily my TF100 arrived on Saturday and I was able to do a full test. 10,000 gallon in-ground pool. Numbers:
    FC: 0
    CC = 0.5 (I had added in a 1lb bag of dichlor a few days prior)
    TC = 2.5
    CH = 325 (My area is known for hard water)
    TA = 110/120
    CYA = 0

    I added in a full gallon of liquid conditioner and started the shock process this morning. After depleting the chlorine rapidly several times I knew something else had to be up. The pool light was burnt out and I needed to figure out if it was 12V or 120V, so i climbed in and unscrewed the pool fixture. Algae everywhere !!. I grabbed my corner brush and scrubbed away, then brushed the sides of the pool again, then kicked on my polaris to stir all that algae up into the water for the chlorine to fight. Now, on to my questions:

    1. Is it safe to leave the pool light out of its fixture? The power is off to the light fixture, and I want to make sure the water can circulate in its cavity to help kill the algae.
    2. Should I have the pump focusing more on the main drain or skimmer? Previously I had the gate set to about 2/3 skimmer and 1/3 main drain, but have moved it to half/half for this step.
    3. Now that I've cleared out a massive clump of algae, should I be doing anything differently other than keeping myself at shock level for a CYA of 30?
    4. My pH is high. I have some muriatic acid on hand, should I add in the recommended amount to get it down lower now, or wait until I pass the OCLT?

    Thanks again so much for all the knowledge and assistance!
    First time pool owner, approx 10,000 gallon in-ground plaster chlorinated pool.

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    AimeeH's Avatar
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    Re: New pool owner - just found a huge algae bloom

    Welcome to TFP.

    1. It should be ok to leave the light out
    2. Not sure. I have different valves for returns than drains and skimmers
    3. You posted test result showing 0 CYA. Assuming you added enough CYA to bring you to 30 then you want to keep at shock level for your CYA
    4. You didn't post your original PH test. Above 10ppm FC the PH test isn't accurate....ignore it for now.

    Questions?
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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    Divin Dave's Avatar
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    Re: New pool owner - just found a huge algae bloom

    Hi,
    good job on getting your pool taken care of.

    as for your questions.
    1. its safe to leave the light out.
    2. I dont think it matters as long as the water is being filtered. 50/50 should be fine.
    3. Dont do anything different. Just SLAM it until all 3 Slam criteria are passed.
    4. You should get your Ph Down before your bring up the FC. FC above 10 will give a false high PH test. Get the PH down to about 7.2 before Slamming.

    Edit to Add: Also if your Ph really is high and you dont bring it down, it will have some effect on of your FC working as well as it should.

    That should do it for ya.

    Good Luck!
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Re: New pool owner - just found a huge algae bloom

    Sorry about that, my pH is 8.2, tested before SLAM began.
    First time pool owner, approx 10,000 gallon in-ground plaster chlorinated pool.

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    Re: New pool owner - just found a huge algae bloom

    If your starting pH was 8.2, you need to halt SLAM and address pH immediately, 8.2 is the maximum reading and anything higher just reads as 8.2.

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    Re: New pool owner - just found a huge algae bloom

    Should I even attempt to add muriatic acid now, or wait till my FC drops down to normal levels and retest, work the pH level to the appropriate range, then restart the SLAM?
    First time pool owner, approx 10,000 gallon in-ground plaster chlorinated pool.

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    pwrstrk's Avatar
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    Re: New pool owner - just found a huge algae bloom

    Your PH test will be invalid with FC levels of 10 or more. 😎
    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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    Re: New pool owner - just found a huge algae bloom

    You should let the FC level fall to less than 10 then retest your pH. It shouldn't take long to drop if you have visible algae. Then adjust your pH to the low 7's and resume the SLAM. Hope it goes quickly for you!
    27' AG 18K Gallons ~ Cartridge Filter ~ Pentair 1.5 HP Pump

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    Divin Dave's Avatar
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    Re: New pool owner - just found a huge algae bloom

    It's a shame, but you should probably let the FC drift below 10, then adjust your PH and start again.

    Quote Originally Posted by utdcole View Post
    Should I even attempt to add muriatic acid now, or wait till my FC drops down to normal levels and retest, work the pH level to the appropriate range, then restart the SLAM?
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Re: New pool owner - just found a huge algae bloom

    Welcome to the forum

    The problem is your are asking a question without providing the necessary information.

    You were at 8.2 before and the FC was near or at zero so the 8.2 is a good number. Because 8.2 is the max on the test you could be 8.2 or 9.0 or ....

    If you have raised the FC level above 10 ppm a new pH test will not be accurate so don't bother to retest pH. You can still use Pool Math to figure out how much acid to add to go from 8.2 to 7.2 That is what I would do now. It will help make your chlorine a little more effective. If you have NOT raised the FC above 10 I'd add the acid and retest in 30-60 minutes and if needed and below 8.2 adjust again to hit 7.2 then start your SLAM.

    If you are already at SLAM FC level above 10 ppm just do the one addition and forget pH until the SLAM is done.

    So I would drop in 25 oz of 34% if 34% is what you have and then depending on your FC level retest if below 10ppm and make another adjustment if needed and then start SLAM or if your over 10ppm wait until the SLAM is done.

    Pool Math - > http://www.troublefreepool.com/calc.html Also button at top, left of page.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
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    Re: New pool owner - just found a huge algae bloom

    How much CYA did you add and what is your CYA target that you are working with ??
    What is your SLAM FC target level ??
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

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    Re: New pool owner - just found a huge algae bloom

    Ok, so I let the pool settle over the morning and just did a full retest. New numbers:
    FC 3.5
    CC 0.5
    TC 3
    CH 275
    TA 90
    CYA 40
    PH 7.8

    Should I go ahead and drop my pH down to 7.2 then resume the SLAM? The water is actually quite clear this afternoon, but I know I want to keep it at SLAM until I pass the OCLT.
    First time pool owner, approx 10,000 gallon in-ground plaster chlorinated pool.

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    pwrstrk's Avatar
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    New pool owner - just found a huge algae bloom

    Yes I would drop the PH to 7.2 or there abouts and then resume the SLAM. 😎
    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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    Re: New pool owner - just found a huge algae bloom

    You can test the pH by diluting the sample (50%) with distilled water (50%). No need to stop the SLAM.
    19.5k gal, 16x32 vinyl liner, sand filter, 1hp single speed pump, K-2006 test kit.

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    Re: New pool owner - just found a huge algae bloom

    Go ahead and get pH down to 7.2 since it should only take an hour or so, then continue your SLAM.
    BTW...TC (Total Chlorine) is FC + CC. Your first post showed 0 + 0.5 = 2.5, and your last post showed 3.5 + 0.5 = 3.
    TC is not needed when reporting. Just want to make sure your FC and CC are the correct numbers.

    Good luck. Sounds like you are getting close.
    16K gal, IG Vinyl, Hayward DE Filter EC-65, 3/4 HP pump, Raypak R266A Gas Heater, Hayward Chlorine Feeder (Retired), Dolphin cleaner. K-2006 w/ Speedstir.
    Pool 18yrs - Liner 14 yrs

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    Re: New pool owner - just found a huge algae bloom

    Sorry about that, it's been a long few days - I subtracted instead of adding :P. I've added in the appropriate amount of muriatic acid and will retest in an hour, adjust if necessary, and resume SLAMing. Thanks everyone, I'll report back with progress and/or questions.
    First time pool owner, approx 10,000 gallon in-ground plaster chlorinated pool.

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    Re: New pool owner - just found a huge algae bloom

    If your recent test was 7.8 and you used pool math to drop in the proper amount of muriatic acid to hit 7.2 don't bother to retest it, get the FC back up !!

    That "M" in SLAM is maintain. Any time you are dropping below the SLAM FC target you are not killing algae. You might have it in check if the FC is close but as the FC drops algae's ability to grow/reproduce increases.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

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    Re: New pool owner - just found a huge algae bloom

    Just thought I'd follow up with a big thumbs up! Two days, 6.5 gallons of 8.25 bleach, and a little less sleep later I've passed the OCLT, CC 0, and the water is sparkling! Thanks so much for the help!

    My next fun adventure - figure out why my bottom-hinged weird doors aren't floating! They move freely if I reach in and move them around, but always end up falling back down flat.
    First time pool owner, approx 10,000 gallon in-ground plaster chlorinated pool.

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    Re: New pool owner - just found a huge algae bloom

    Great job on taking control and resolving your algae bloom.

    It would probably be best to start a new thread for your doors under pool equipment.
    16K gal, IG Vinyl, Hayward DE Filter EC-65, 3/4 HP pump, Raypak R266A Gas Heater, Hayward Chlorine Feeder (Retired), Dolphin cleaner. K-2006 w/ Speedstir.
    Pool 18yrs - Liner 14 yrs

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    Re: New pool owner - just found a huge algae bloom

    Maybe the Weird door problem with the weir doors is the floatation has become detached over the years - - > https://www.google.com/#q=weir+door+foam
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

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