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Thread: Cloudy water with SWG, no FC and very low CC

  1. Back To Top    #1

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    Cloudy water with SWG, no FC and very low CC

    OK, I should know what to do about this, but thought I'd check due to the low FC and CC levels...
    I've had my Intellichlor SWG for a couple months now, it runs 12 hrs/day with the pool pump. At 40% run time, it was edging up to 4.0+ FC (highest level recommended by the manufacturer), so I dropped to 20% for the last week or so.
    The water got a little cloudy on us earlier this week (it has been hot here), so I shocked it last night with bleach, figuring on possible algae. I seem to be in range with my numbers (or at least close), with the exception of FC:
    TA - 100
    CYA - 40 (added some)
    FC - 0.0
    CC - .5 or less
    pH - was 7.8, I added acid to lower

    SO, does it seem like this is algae? I'm a little confused due to the 0.0 FC; I've had good levels until this week using the SWG.
    thanks
    Todd
    --------------
    Pool: 16x36, 16,800 gal., vinyl, sand filter, SWG & AquaCal Heat Pump
    Spa: Hot Springs Sovereign, 355 gal., ozone/ion
    The most helpful tool you'll ever have for your pool:
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    JasonLion's Avatar
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    Re: Cloudy water with SWG, no FC and very low CC

    You have algae. Zero FC and cloudy water is a sure sign.

    You are going to need to shock the pool properly, maintaining shock level till the pool holds a FC level and there is no FC loss overnight. See this article from Pool School for details.

    Your SWG will also work better if you raise the CYA level to around 70-80, though I would wait till the current algae issue is resolved before doing that.
    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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    Re: Cloudy water with SWG, no FC and very low CC

    Cool, Jason, thanks ... With Baquacil, it was cloudy a good bit of the time anyway, but with Chlorine I figured something had to be up, since it has been so clear for so long before this week.
    Todd
    --------------
    Pool: 16x36, 16,800 gal., vinyl, sand filter, SWG & AquaCal Heat Pump
    Spa: Hot Springs Sovereign, 355 gal., ozone/ion
    The most helpful tool you'll ever have for your pool:
    http://www.poolcalculator.com/

  4. Back To Top    #4

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    Re: Cloudy water with SWG, no FC and very low CC

    Hey Jason (or anyone who knows SWG's),
    My Intellichlor manual states that anything above 4.0 FC can damage the equipment, but if I shock, I have to go above 4.0 FC, right?
    Also, would I drop the SWG down to 0% while shocking, to 'protect' the cell from damage?
    Todd
    --------------
    Pool: 16x36, 16,800 gal., vinyl, sand filter, SWG & AquaCal Heat Pump
    Spa: Hot Springs Sovereign, 355 gal., ozone/ion
    The most helpful tool you'll ever have for your pool:
    http://www.poolcalculator.com/

  5. Back To Top    #5
    JasonLion's Avatar
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    Re: Cloudy water with SWG, no FC and very low CC

    When CYA is zero, FC levels above 5 just start to pose some slight risk to the equipment. Once you have any CYA in the water you can bring FC up significantly higher without any risks.
    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

  6. Back To Top    #6

    Join Date
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    Re: Cloudy water with SWG, no FC and very low CC

    OK that's great news, thanks again Jason.
    Todd
    --------------
    Pool: 16x36, 16,800 gal., vinyl, sand filter, SWG & AquaCal Heat Pump
    Spa: Hot Springs Sovereign, 355 gal., ozone/ion
    The most helpful tool you'll ever have for your pool:
    http://www.poolcalculator.com/

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