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Thread: First test results are in - Pool Store Tests are different

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    Join Date
    Dec 2015
    Location
    Sacramento California
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    12

    First test results are in - Pool Store Tests are different

    Hello Everyone. So a little back story, pool was completed in November and after the 2 week startup was done I had the start up company do weekly chemical service since I was traveling in Dec. I cancelled yesterday and assumed service today. Below are my TF-100 test results vs the pool store test results (looks like they used a giant Taylor kit marked service).

    TF-100 / Pool Store
    FC =5.5 / 3
    PH = 8.2 / 7.8
    TA = 140 / 120
    CH = 375 / 290
    CYA = 45 / 45
    CC = 0 / 0



    My main question is why is FC so different? Is it because I used a FAS/DPD and they just used the drops (I think its called OTO?) Also the service company came on Mondays, looks like I used almost no chlorine......Were they just making it super high to last a week?
    What about the difference in Hardness?


    Anyway I adjusted the PH this morning. looks like 16 oz of acid did the trick

    Thanks
    Build Date 11/18/15 - 14K IG Gemstone (Pebble) pool, Hayward EcoStar Variable Speed Pump, 425sf SwimClear Cartridge Filter, Polaris 280 Pool Sweep with Booster Pump, Hayward Command 4 control system, GVA-24 Actuator, LED Light, Water Fall

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    Mod Squad kimkats's Avatar
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    Jul 2012
    Location
    Tallahassee, FL
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    26,737

    Re: First test results are in - Pool Store Tests are different

    On the FC with the PS they for sure were making it REAL high to last the week.

    The difference in the FC results would be the different tests. YOUR test is a lot more accurate!

    As for the difference in Hardness.......I am not sure about that one but am willing to bet YOUR test is the correct one.

    I am willing to bet they did not clean their tubes between pools.

    Good job taking care of your pool!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Join Date
    Dec 2015
    Location
    Sacramento California
    Posts
    12

    Re: First test results are in - Pool Store Tests are different

    Quote Originally Posted by kimkats View Post
    On the FC with the PS they for sure were making it REAL high to last the week.

    The difference in the FC results would be the different tests. YOUR test is a lot more accurate!

    As for the difference in Hardness.......I am not sure about that one but am willing to bet YOUR test is the correct one.

    I am willing to bet they did not clean their tubes between pools.

    Good job taking care of your pool!

    Kim
    Thank You
    Build Date 11/18/15 - 14K IG Gemstone (Pebble) pool, Hayward EcoStar Variable Speed Pump, 425sf SwimClear Cartridge Filter, Polaris 280 Pool Sweep with Booster Pump, Hayward Command 4 control system, GVA-24 Actuator, LED Light, Water Fall

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    duraleigh's Avatar
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    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,085

    Re: First test results are in - Pool Store Tests are different

    Trust YOUR tests.

    Year after year, the pool stores just don't test as well as pool owners with good test kits.

    Lower you pH into the mid 7's.....keep it there.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad tim5055's Avatar
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    May 2014
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    Columbia, SC
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    8,499

    Re: First test results are in - Pool Store Tests are different

    You just joined last month, but if you have read around here much you have probably seen that not much credence is given to pool store testing. While you would think that a "professional" would be the best, unfortunately in most cases it is quite the opposite. Between employees who blindly trust the word of chemical sales representatives and high school kids working in the pool store part time, working too quickly or the employee just not wanting to be there you end up with poor results from their testing. In my case two different pool stores told me my CYA was "fine", around 70 or 80. When I tested myself I found it over 200. While some may be different, remember the pool store exists to make money for the owner, not to keep your pool nice. If you are ever bored, take multiple samples of the same water to several stores. Note the results they provide and the recommendations they make.

    As an aside, there is no 45 on the CYA test. As the scale on the tube is not linear half way between 40 and 50 is not 45. For our purposes just round up to the next number on the scale. This will also match our published recommended levels ie, the CYA/FC chart.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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