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Thread: Which Test Results to Believe?

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    Which Test Results to Believe?

    I use Taylor's K-2005 and TFTestkit TF-100 to test my pool water daily/weekly. I do the weekly test on Saturdays. Through June and so far this month my test results have been very consistent.

    After yesterday's, weekly test I took a sample to the pool store for a "professional" water test. The results of their test amazed me!

    Here are the results: Mine: FC 3.5 Theirs: FC 2.42
    TC 3.5 TC 2.42
    CC 0.0 CC 0.0
    pH 7.6 pH 7.8
    CH 280 CH 215
    ALKc 58.5 ALKc 61
    CYA 50 CYA 73
    Borate 50 Borate 50
    Salt 3200 Salt 2900

    As you can see, only two of their tests matched mine; CC and Borates.

    The pool store uses a computer program to do the test, it is called Waterlink Datamate 10 by LaMotte. A small water sample is injected into a plastic wheel which is then put into a test box which analyzes the water.

    Which results do you suggest I use, Taylor's K-2005/TF-100 or Waterlink Datamate 10?
    19.5K, 18'x40', oval, IG, pebble, saltwater pool
    Jandy, 48 sf., DE filter (using Zeo Fiber instead of DE)
    Jandy, PLC 1400, SWG
    Zodiac, 1HP, single speed pump

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    Richard320's Avatar
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    Jan 2010
    Location
    San Dimas, CA (LA County)
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    18,768

    Re: Which Test Results to Believe?

    Yours.

    Check this thread: inconsistency-in-readings-t61728.html

    Edit: check out the bouncing CYA readings down near the bottom of the first post!
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Join Date
    Jun 2013
    Location
    SpringHill FL
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    Re: Which Test Results to Believe?

    I will always trust your test results over a poolstores test results any day of the week
    Nathan
    15x30 gunite 18k gallons Hayward star clear plus 120sqft cart

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    Join Date
    Jun 2013
    Location
    SpringHill FL
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    415

    Re: Which Test Results to Believe?

    If your concerned run your tests twice you might get slightly varying results but they are within the accuracy limits of the test.
    Nathan
    15x30 gunite 18k gallons Hayward star clear plus 120sqft cart

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,083

    Re: Which Test Results to Believe?

    One of the most important rules of BBB is to always trust your own testing.

    That rule assumes you have a good kit with good reagents, of course, but you should have confidence in your own test results.....that's why you bought the kit.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  6. Back To Top    #6

    Join Date
    Aug 2011
    Location
    Northville, Mi
    Posts
    307

    Re: Which Test Results to Believe?

    This is just my opinion...

    The "good" range for any test is a lot smaller than the bad range. If a pool store's tests aren't accurate, it's extremely likely that result will fall in a "bad" range. If something is in the bad range, that's an opportunity for them to sell you something to "fix" the bad result. So pool stores don't *care* if their results are accurate or not.

    Trust your own results.
    15,400 gal, 16x32 vinyl rectangle (sport dig), Intelliflo VS, 240 sqft cartridge filter, Intellichlor IC40, Mastertemp 250, Dolphin supreme M4 cleaning, Pentair EasyTouch4

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