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Thread: Water testing variances

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    Join Date
    Sep 2012
    Location
    Cypress, TX
    Posts
    63

    Water testing variances

    Hello all. Many thanks for all of the shared information on this site. Please pardon any posting mistakes that I may make - hopefully my sig shows the needed info on my pool. Water is crystal clear and I'm using a stenner pump for bleach injection.
    My main goal is to get up to speed on my testing process before warmer weather arrives. The pool is three months old and pH / Alkalinity are holding fairly steady.

    I have the TF100 kit as well as the Rainbow kit that came with the pool. I have pebblesheen and for warranty purposes I am required to use a store with computerized records. In order to assess the validity of the store results, I did my own tests and then took a sample to three different stores. No surprise - there is a fairly wide range of variance in the results and I would greatly value your collective feedback on the results and specifically your advice on Alkalinity as that is where even my tests vary.

    The three stores I will refer to as stores W,T, and L. My results are all from TF100 as well as the rainbow for Alkalinity. Hopefully my attemp at a 'chart' will work. Many thanks in advance for any feedback / observations / reccomendations!!

    ------W--------T--------L--------TF100 / Rainbow
    FC----4--------1.8-------2--------2
    TC----4--------1.8-------2--------2
    pH----7.6------7.2-------7.6------7.5
    TA----55-------78-------100------60 / 90
    CH----220------258------210------310
    CYA---80-------27-------25-------25
    18,000 Gallon IG, Pebble Sheen, Quartzite coping
    Pentair 420 Cartridge Filter, 2HP Silencer, 400,000 BTU Heater, Platinum Legend Cleaner
    2x IntelliFlo VS pumps - Screenlogic Interface - Stenner 45MPHP10 15 Gal Bleach Injection
    TF100 + PoolCalculator + This Site!

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Water testing variances

    Store testing simply isn't very reliable. W is clearly wrong on CYA, and FC. T is clearly wrong on PH. L is high on TA and their CH results seems rather unlikely. None of this is at all surprising, store testing is way off amazingly often.

    I'd go with the TF100 test results over everything else. Of these results, clearly FC/TC is around 2, PH is around 7.6, TA is around 60 or 70, CYA is around 30. The only one that isn't obvious is CH, which is somewhere between 200 and 320, most likely around 300 but hard to be sure.
    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

    Join Date
    Sep 2012
    Location
    Cypress, TX
    Posts
    63

    Re: Water testing variances

    Thanks for the confirmation. I'm sticking with the TF100 results and will get make the monthly rounds for warranty purposes. Maybe I'm a little disturbed, but I must say I rather enjoy visiting the stores and seeing their results and watching their attempts to hawk products. Fortunately I've been lurking on here for several months soaking in the info and have not been PoolStored!
    "OMG YOUR PHOSPHATES ARE THROUGH THE ROOF - IS YOUR POOL A SWAMP? YOU NEED THIS!"

    Thanks again
    18,000 Gallon IG, Pebble Sheen, Quartzite coping
    Pentair 420 Cartridge Filter, 2HP Silencer, 400,000 BTU Heater, Platinum Legend Cleaner
    2x IntelliFlo VS pumps - Screenlogic Interface - Stenner 45MPHP10 15 Gal Bleach Injection
    TF100 + PoolCalculator + This Site!

  4. Back To Top    #4
    UnderWaterVanya's Avatar
    Join Date
    Jun 2012
    Location
    Mint Hill, NC
    Posts
    2,589

    Re: Water testing variances

    Quote Originally Posted by rjward
    "OMG YOUR PHOSPHATES ARE THROUGH THE ROOF - IS YOUR POOL A SWAMP? YOU NEED THIS!"
    What do you say when they say this?
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

  5. Back To Top    #5

    Join Date
    Sep 2012
    Location
    Cypress, TX
    Posts
    63

    Re: Water testing variances

    It really depends on the mood I'm in and the attitude of the clerk. Sometimes I like to play with them just to hear what they have to say, other times I just shake my head and walk away. Then there's the classic snort of derision.....
    18,000 Gallon IG, Pebble Sheen, Quartzite coping
    Pentair 420 Cartridge Filter, 2HP Silencer, 400,000 BTU Heater, Platinum Legend Cleaner
    2x IntelliFlo VS pumps - Screenlogic Interface - Stenner 45MPHP10 15 Gal Bleach Injection
    TF100 + PoolCalculator + This Site!

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