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Thread: Strips register 0 chlorine

  1. Back To Top    #1

    Strips register 0 chlorine

    I can really use your help. I'm at my wits end. My pool is crystal clear blue and yet my strips register 0 for chlorine (even after I shock the pool). I don't think the strips are defective. I bought 2 batches and I got the same reading for both. I had my water analyzed and these are the results from the analysis report:
    Free available chlorine: 2
    Total available chlorine: 2
    Calcium hardness: 210
    Cyanuric acid: 60
    Total alkalinity: 90
    pH: 7.4
    Copper: 0
    Iron: 0
    Phosphates: 100

    Any suggestions?

  2. Back To Top    #2
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Houston, Texas

    Re: Strips register 0 chlorine

    Hi, welcome to TFP! Test strips are notoriously inaccurate. The best way to test the pool is to use a high quality test kit such as a Taylor k2006 or the TF100. When you test your pool daily you will have consistent, accurate results and can dose the pool accordingly.

    The next issue is that your Chlorine is too low for your CYA level. You should be keeping the FC between 5-10ppm for a CYA of 60. When you let the FC drop below 5ppm you run the risk of an algae bloom. Also you don't mention if you have a vinyl liner or a plaster surface pool. The correct calcium level depends on the type of pool surface. You can use the Pool calculator to determine the correct levels for your pool.
    TFP Moderator
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  3. Back To Top    #3

    Join Date
    Feb 2008
    Denton, TX

    Re: Strips register 0 chlorine

    Welcome to TFP!

    You really need a good test kit in order to properly manage your pool. Many people here have the TF-100, found only at You can also get a Taylor K-2006 in various places online.

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