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Thread: Can salt water test strips go bad?

  1. Back To Top    #1

    Join Date
    Mar 2008
    Location
    Central VA
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    328

    Can salt water test strips go bad?

    I've got the salt water test strips that duraleigh carries, and last season the strips were spot-on with what my SWG was reading.
    I had to replace the SWG cell in the off-season, so the cell could be partly to blame here, but this year, the same test strip bottle was reading 4700+ when I tested, while the SWG cell was showing Low salt (which is under 3000, if I remember correctly). I bought a new test strip bottle, and the new strip is showing 3700 or thereabouts, so that means it disagrees with the old strips by 1000 ppm.
    And even though the new strips are showing 3700, the SWG cell is still showing Low, when it should be showing Good. I'm afraid my SWG (Intellichlor) may not be producing much chlorine as a result, as I'm right at 2.0 ppm CL, on the low end of the recommended level.
    Any ideas?
    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/

  2. Back To Top    #2
    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,887

    Re: Can salt water test strips go bad?

    Yes, the salt test strips can go bad. They will go bad very quickly if they get damp, even high humidity can do it over time, and they don't usually last much beyond then their expiration date.
    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

  3. Back To Top    #3
    grumpy's Avatar
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    Jan 2009
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    Coastal South Carolina
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    Re: Can salt water test strips go bad?

    So, what was your salt reading last year? Is the new bottle of strips close to what you expected the salt level to be? If your chlorine is only 2.0 ppm, what % is your SWG set on?

    There have been a number of us reporting that their fairly new intellichlor units show low salt when the test strips show the salt level to be correct.
    12170 Gallon in ground San Juan Caesar's Palace fiberglass with integral Spa in a screened enclosure. 1 HP Pentair Whisperflow pump with Pentair Sand Dollar SD-80 sand filter. Intellichlor IC40 with EasyTouch wireless remote. Aquacal Heatwave Heat Pump. Taylor K-2006 and Aquachek Salt test strips.

  4. Back To Top    #4

    Join Date
    Mar 2008
    Location
    Central VA
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    Re: Can salt water test strips go bad?

    I think the reading on the new strips may be correct...since I expected low salt on start-up this season, I added a couple of bags of salt while the light was showing Low before I realized I had a test strip issue. These new strips read right at 3700, which is more or less where I expected to be. So I think my Intellichlor may be reading Low when the water is actually okay. I had read something about calibrating a SWG, maybe that's the answer?
    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
    grumpy's Avatar
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    Jan 2009
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    Coastal South Carolina
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    64

    Re: Can salt water test strips go bad?

    My IC-40 shows low salt too. It varies between 2700 ppm and 2900 ppm frequently and for no reason that I can detect. The strips say that my salt is 3600 ppm and are very consistent.

    I have my unit set on 10% with 12 hour per day run time and it easily maintains 4 to 5 ppm FC depending on bather load.

    For now, I've decided not to calibrate the SWG. I suspect that it would begin to drift again and I'd spend a lot of time chasing it. After all, the yellow light on the cell is only telling you to check the salt. If it turns red, that's a different story.

    Is your FC still 2.0 ppm? What is your SWG setting? How long is your pump run time? How are you testing your water? We'd like to see a full set of numbers from a complete test to help you keep your pool Trouble Free.
    12170 Gallon in ground San Juan Caesar's Palace fiberglass with integral Spa in a screened enclosure. 1 HP Pentair Whisperflow pump with Pentair Sand Dollar SD-80 sand filter. Intellichlor IC40 with EasyTouch wireless remote. Aquacal Heatwave Heat Pump. Taylor K-2006 and Aquachek Salt test strips.

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