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Thread: Which readings to use?

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    Which readings to use?

    I just recently had my pool water checked at 2 different pool stores. They are literally across the street from each other and the tests were done within 15 minutes of each other. The problem is the results are vastly different. Pool store one used a BioGuard testing system which appeared to be more automated. Pool store 2 used the typical drops, agitation and shake tests. Here are the results:

    Pool Store 1 Pool Store 2

    Total Chlorine 5.5 5.0
    Free Chlorine 3.9 5.0
    PH 7.5 8.0
    Total Alkalinity 95 100
    Calcium Hardness 250 360
    Stabilizer (CYA) 50 100
    Salt 3100 2600 (AutoPilot reads 3500)

    My pool looks good but of course each pool store is trying to sell me it's own set of chemicals to correct
    any issues. Which results should I use? Or would purchasing my own test kit be more accurate?
    Thanks for any advice.

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Which readings to use?

    Purchasing your own test kit is by far the best solution.

    These results are a little more mystifying than usual. It is difficult to get the PH test wrong by that much, yet clearly one of the stores did. If one of them made that error then there is no reason to believe their other results. But it isn't obvious which of them is wrong.
    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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    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Re: Which readings to use?

    Your own test kit.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner

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    Butterfly's Avatar
    Join Date
    May 2007
    South Carolina

    Re: Which readings to use?

    Hi peco,

    Yep, your own test kit. I recommend the TF Test kit sold by duraleigh (Dave) one of our members. His kit also comes with 'customer service'! Link in my sig.

    You will never regret having total control over your water chemistry!

    Welcome to the forum.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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