Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 9 of 9

Thread: Pool Store Testing

  1. Back To Top    #1

    Join Date
    May 2014
    Location
    North Carolina
    Posts
    15

    Pool Store Testing

    Disclaimer - I have the TF-100 and use it regularly (used to use the Taylor similar kits) and have been testing my own pool for a long time and am very comfortable with it. A long time ago I used to periodically take samples to the local pool stores for check/comparison, but stopped that practice based on the large variability in results. Fast forward: today's pool stores seem to have shifted to computerized testing (I think Clear Care is a big name) which uses a very small water sample but I believe it "samples" the sample multiple times (10?) to arrive at results. Not sure what the analysis methodology is that it uses, but it does seem to be relatively consistent. I have the good fortune to be able to get my water tested just about as often as I want at a store and I've been comparing results to the TF 100. Pretty close. CYA and TA are very close, certainly within the testing method accuracy. Their Chlorine (TC and FC) tends to run a bit lower than the TF 100 results but only by 1-2 ppm for TC. pH is pretty close with the TF 100 test usually a bit lower than the store, but it's a subjective color comparison test so probably not worth mentioning.

    So, question: Has pool store testing generally improved to the point that you can rely on the results? Everybody weigh in!
    15K, IG, Sunstone Pearl (pebble) finish, Pentair EasyTouch 8 control system, Pentair IntelliFlo VS pump, Pentair IC 40 SWG, Pentair CC200 Cartridge filter, solar heating - 4th time pool owner

  2. Back To Top    #2
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Location
    Central Minnesota
    Posts
    5,079

    Re: Pool Store Testing

    This just seems like a thread.

    *insert my canned response here*
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  3. Back To Top    #3
    JesseWV's Avatar
    Join Date
    Apr 2011
    Location
    North Central WV
    Posts
    526

    Re: Pool Store Testing

    You just can't make a general blanket statement about pool store testing getting better. Their test practices, testing methods, and test results are all across the board. Because they generally hide the testing process there's no way to know what they used or how they arrived at the numbers.
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

  4. Back To Top    #4
    Isaac-1's Avatar
    Join Date
    May 2010
    Location
    SW Louisiana
    Posts
    6,711

    Re: Pool Store Testing

    Personally I think some of these new computerized testers are getting better, they still have problems, lets take the Waterlink Spin-Lab as an example. While results if used correctly seem to be fairly good, there are numerous chances to introduce operator errors. The test disk must be filled with a syringe while laying flat on a CLEAN surface, overfilling is a problem, and it must be handled by the edges only.

    Here is an instruction video for the spin lab https://www.youtube.com/watch?v=uDyJJn8J_pc If you want to take 5 or so minutes watch it for yourself, and ask yourself if you trust the kid in the pool store can and more importantly WILL pay attention to those details?

    Ike

    p.s. also note the spin lab machine costs about $1,000 and the test disks cost about $2 each
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

  5. Back To Top    #5

    Join Date
    Aug 2011
    Location
    Southern California
    Posts
    188

    Re: Pool Store Testing

    For me, it makes no difference if the pool store testing has gotten better. Doing my own tests saves me trip there and back. I see no point in wasting my time and money to have them do something I can do from home.

  6. Back To Top    #6
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: Pool Store Testing

    If they are better, a variation of 1.0 PPM+ TC isn't acceptable. So I would say they still need improvement.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  7. Back To Top    #7

    TFP Guide
    mrcarcrazy's Avatar
    Join Date
    Jan 2014
    Location
    Odessa, TX
    Posts
    973

    Re: Pool Store Testing

    I don't know much about water testing devices....but I know blood testing devices. An electronic testing device in the healthcare world is only as good as the person who does the QC/calibration and the chemicals used to QC/calibrate. I expect that is also true in the water world. The machine I use 30x/day is QC'd with every sample (I'm lucky, my QC's are built in...this just means every sample costs more to get a reading on....and it makes the machine more idiot proof.) I'm a fairly well educated idiot. The point of this rant is that every store will be different (much like every lab is different - they try and try to minimize these differences...but they are). This is unavoidable currently. I may be lucky and find a store near me that has someone who knows what they are doing, and has a quality machine that reads accurately, where as a friend 20 miles away might not have the same luck...you just never know, and It could always change (say someone forgets to calibrate the machine....)
    IG gunite/plaster pool/spa Started 1/17/14, Plastered 5/16/14
    Size: 12'-21'x39' free form, depth ranging from 4' to 7, attached 6 person spa with spillover.
    Equipment: Whisperflo 2hp pump, Pentair 30" sand filter, Pentair Mastertemp 400k BTU heater, 1hp Whisperflo for waterfalls, and a blower for spa floor

  8. Back To Top    #8

    Join Date
    May 2014
    Location
    North Carolina
    Posts
    15

    Re: Pool Store Testing

    All good comments and thx for "weighing in" - Ike, I think that is the tester that I have seen
    15K, IG, Sunstone Pearl (pebble) finish, Pentair EasyTouch 8 control system, Pentair IntelliFlo VS pump, Pentair IC 40 SWG, Pentair CC200 Cartridge filter, solar heating - 4th time pool owner

  9. Back To Top    #9
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: Pool Store Testing

    I'm sorry, I forgot my manners.

    Welcome to TFP!
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •