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Thread: New house, old pool: Algae

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    Join Date
    Sep 2014
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    Elgin, IL
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    New house, old pool: Algae

    Hi! I just bought a house with a pool and am doing a "professional" closing on Wednesday. Former pool owner and successful (in the past anyway) K2006 user.

    Pool stats: 16K in-ground, badly faded vinyl. Sand filter, 1hp pump.

    Scoured green-algae covered jets, steps, skimmer, built-in steps, behind pool light. Original test results were silly. No CYA, low pH, no FC. I have added in the week that I have had the house, 40 gallons of 12.5% CL, 12C 99% dichlor, 4 boxes borax, and DE to filter after both back-washes.

    Water now "clear". CC finally down from >5ppm. I add at least 4G CL at night and don't retest until the next afternoon and now getting around 5-6 FC in the afternnon with 0 to 0.5 CC. I work from 4am- 1pm so had to wait until tonight to do an OCLT. Tonight was to be the night, but I need help!!!

    7pm test results:
    FC 4.5
    CC 0
    PH 7.4
    CYA best guess 25-30
    TA 150
    CH 400

    Added 4 gallons 12.5%

    An hour later:

    It looks like 13 FC but the color is GREY instead of clear. I went ahead and kept adding drops but grey stayed

    CC is either 2 or 16. At 2 it turns grey, at 16 it gets more clear.

    Why am I getting this grey color? I have never seen that before.

    I am almost out of time before closing and would love to get overnight test results but don't know how interpret my starting point tonight. Can someone help?
    Last edited by Tanker; 09-21-2014 at 11:56 AM. Reason: Add signature

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    Mod Squad tim5055's Avatar
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    Re: New house, old pool: Algae

    What test kit are you using?

    It would also help us if you would add the following information to your signature


    • The size of your pool in gallons
    • If your pool is an AG (above ground) or IG (in ground)
    • If it's IG, tell us if it's vinyl, plaster/pebble, or fiberglass
    • The type of filter you have (sand, DE, cartridge) and, if you know, the brand and model of the filter.
    • If you know, please tell us the brand and model of the pump, and mention if is it a two speed or variable speed pump.
    • Date of pool build/install, particularly important if less then a year old.
    • What kind/model of water test kit you are using
    • Other significant accessories or options, such as a spa , SWG, or cleaner
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Elgin, IL
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    Re: New house, old pool: Algae

    Thanks for responding, Tim. Signature official now.

  4. Back To Top    #4

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    Re: New house, old pool: Algae

    Maybe no one else knows either. It's a busy time for the forum also.

  5. Back To Top    #5
    Butterfly's Avatar
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    Re: New house, old pool: Algae

    Quote Originally Posted by Tanker View Post
    Maybe no one else knows either. It's a busy time for the forum also.
    Are you sure you are using the right bottle of reagent? I'd double-check that first. Don't ask me why

    Also, why is CH 400?
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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  6. Back To Top    #6

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    Elgin, IL
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    Re: New house, old pool: Algae

    I just bought the house so I don't know about CH. I moved from down the block so I assume it's not the fill water but will test it after I am done closing. The former owners used BioGuard products and I'm guessing they used a lot of calcium hypochlorite bags. You can actually see exactly where they dumped bags in and never stirred to dissolve it. There are many ~3x12" patches of speckled-white fading on the vinyl floor. Geez.

    As for reagent, that's a thought, but I am sure I used the R0871. Our 12.5% can be really strong as it is packaged near here. Maybe the FC was really high? The liner is bad anway, so I was aiming for around 35-40ppm by adding 4G of 12.5%. I wonder if I actually might have gotten to >50ppm. They say Taylor tests only to 50. Just a thought.

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    Re: New house, old pool: Algae

    They say Taylor tests only to 50. Just a thought.
    That's a guideline but only a guideline. I have tested 76 ppm FC accurately using the FAS/DPD test.

    I think the 50 ppm might be more of a , "why would you go any higher than that, anyway?" sort of limitation.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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