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Thread: Intex SWG generates chlorine, but no chlorine when tested

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    Intex SWG generates chlorine, but no chlorine when tested

    Hello everyone, I'm new here but not entirely new to pool maintenance. I bought my 16' Intex UltraFrame pool last summer, and had no real issues with it. This year, the SWG did not work immediately after setup, and the water had no chlorine in it for about a week. After cleaning the electrolytic cell with vinegar, the SWG started generating chlorine. I know this because testing water that comes right out of the pump while running indicates free chlorine. HOWEVER, testing the water in the pool reveals no free chlorine, and no total chlorine (which makes zero sense to me). How can I restore balance? Here are my test results:

    FC - 0 ppm
    CC - 0 ppm
    pH - 7.0
    TA - 150 ppm
    CH - I have a DPD test kit, I don't think I can measure this; can I?
    CYA - I have not added any stabalizer (perhaps I should, but haven't). I also do not have a test kit for this.

    Suggestions?
    16' Intex UltraFrame - 5,061 gallons - Above Ground
    2,000 GPH Cartridge filter (came with the pool) - Type A filter
    Intex Salt Water Chlorine Generator

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    JasonLion's Avatar
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    Re: Intex SWG generates chlorine, but no chlorine when teste

    It is crucial to know your current CYA level. If you can't test it, you can get a pool store to test it for you.

    Without any CYA in the water you lose all of your chlorine to sunlight just as quickly as it is produced. With too much CYA in the pool you can have a very low level algae problem with out any obvious visual signs of trouble.
    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: Intex SWG generates chlorine, but no chlorine when teste

    Will I have CYA in my pool regardless of whether I have added it?
    16' Intex UltraFrame - 5,061 gallons - Above Ground
    2,000 GPH Cartridge filter (came with the pool) - Type A filter
    Intex Salt Water Chlorine Generator

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    Re: Intex SWG generates chlorine, but no chlorine when teste

    If you have never used any chlorine tablets (trichlor) and never added any granular chlorine (dichlor) and never added any stabilizer/conditioner/cyanuric acid, then your CYA level will be zero.
    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: Intex SWG generates chlorine, but no chlorine when teste

    OK. Since this is the kind of pool that I take down and put up each year, I have not added any CYA. I think that last year we used "regular" chlorine before buying the SWG, which may have accounted for my lack of problems. So, it sounds like I should first get some CYA for my pool. How do I determine how much I'll need? Should I buy chlorine tabs instead, for an initial dose of chlorine?

    Thanks for your fast responses, btw!
    16' Intex UltraFrame - 5,061 gallons - Above Ground
    2,000 GPH Cartridge filter (came with the pool) - Type A filter
    Intex Salt Water Chlorine Generator

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Intex SWG generates chlorine, but no chlorine when teste

    You should add some stabilizer/conditioner/cyanuric acid to raise CYA up to around 70 to 80. It is sold under various names. Look for something that lists cyanuric acid as the only ingredient (95+%).
    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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