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Thread: Something is off

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    botanica37's Avatar
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    Feb 2009
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    Oakton, VA
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    Something is off

    I can't figure out what is going on. The water in the pool is murky, off color, not the crystal clear blue I am used to. Here are my numbers:

    FC 4
    CC 0
    PH 7.5
    CYA 40
    TA 90
    CH 260
    t 81F

    The only difference is this year I didn't use any borax. Could that be it or is something else going on? Any thoughts would be greatly appreciated.
    free form 40k gal, IG, plaster, Triton II 100C sand filter, Lite 2 heater
    1 1/2 HP Pentair Ultra Flow High Performance pump
    Caretaker in-floor cleaning system

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    JasonLion's Avatar
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    Re: Something is off

    Murky water is nearly always algae, though once in a long while it happens because the filter isn't working.

    Did you just open the pool, or was the water clear and then turned murky later?
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    botanica37's Avatar
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    Re: Something is off

    The water was clear and then turned dull and murky about a week or so ago. But since my CC is 0, I thought that can't be algae? And the FC holds steady overnight.
    free form 40k gal, IG, plaster, Triton II 100C sand filter, Lite 2 heater
    1 1/2 HP Pentair Ultra Flow High Performance pump
    Caretaker in-floor cleaning system

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    Richard320's Avatar
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    San Dimas, CA (LA County)
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    Re: Something is off

    The easiest way to determine if it's algae or filtration is to blast it with chlorine. If it clears up, it was algae. If it doesn't, you're only out a few bucks. If it does, you spared yourself mucking around with the filter.
    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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    botanica37's Avatar
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    Re: Something is off

    I guess I am worried about mustard algae most of all, that would be a lot of chlorine There was something yellow on one of the walls, but brushed off immediately. OK, I am off to Costco to stock up, just to be safe.
    free form 40k gal, IG, plaster, Triton II 100C sand filter, Lite 2 heater
    1 1/2 HP Pentair Ultra Flow High Performance pump
    Caretaker in-floor cleaning system

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