Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 13 of 13

Thread: Test discrepancy TA

  1. Back To Top    #1

    Join Date
    Jun 2011
    Location
    Carbondale, Illinois
    Posts
    62

    Test discrepancy TA

    I have two test kits that are giving me completely different readings on TA. My pH is consistent at 7.5 for both kits. One kit is a new TF-100 refill plus the old one from last year are both giving me a reading of 110. My pool guy's test kit that I currently have is different. Instructions say 1 drop of chlorine neutralizer, 1 drop of a blue indicator, and then 1 drop at a time of the third thing to get the result. With that test I'm getting a result of 60. With the sample he took to the shop, he says he got a result of 60.

    Full set of results with the TF-100: pH 7.5, TA 110, FC 3-4, cya 70

    I'm using a sand filter and SWG, but there is also a portable DE filter set up (long story). I'm not familiar with DE filters but can't imagine this causing a problem.

  2. Back To Top    #2

    TFP Guide

    Azgirl71's Avatar
    Join Date
    Apr 2015
    Location
    Sierra Vista, Az
    Posts
    2,586

    Re: Test discrepancy TA

    Are you wiping the tip of the R009 before and between each drop as directed?
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

  3. Back To Top    #3

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Test discrepancy TA

    Toss the pool guys kit. That may sound flippant but it's not.

    You have a known quantity in the TF-100 that you paid good money for. For that price you can expect precision and dependabillity.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    Jun 2011
    Location
    Carbondale, Illinois
    Posts
    62

    Re: Test discrepancy TA

    @duraleigh that's my instinct. I really feel mine is right, but now I'm stuck with too high TA for my SWG because he added baking soda. He called me this morning and told me to add more but I didn't.

    - - - Updated - - -

    I ended up buying a new test kit refill because he had me convinced mine was wrong but I'm getting the same results. I don't know how old his is but he claims his is right because he calibrates it against his shop tests. His are different reagents. Goes from blue to clear.

  5. Back To Top    #5

    Join Date
    Aug 2014
    Location
    Northern IL
    Posts
    4,615

    Re: Test discrepancy TA

    I am not being flippant here, really. But I am confused. If you have a good test kit, why do you have a "pool guy"? Are you out-of-town a lot or something?

  6. Back To Top    #6

    Join Date
    Jun 2015
    Location
    Akron Ohio
    Posts
    23

    Re: Test discrepancy TA

    I am having a test discrepancy issue as well but with FC. See my post here:

    http://www.troublefreepool.com/threa...-refill-bottle

    Maybe the tips are not dispensing the right amount of reagent? TFTestkit is looking at the issue for me now.
    30k IG concrete and fiberglass, 1HP Hayward Superpump, Pentair FNS plus 60 DE, Polaris 180, Taylor K2006 with TFTestkit refills, Stenner pump

  7. Back To Top    #7

    Join Date
    Jun 2011
    Location
    Carbondale, Illinois
    Posts
    62

    Re: Test discrepancy TA

    We have a pool guy right now because we're doing a new construction of a pool house. I needed someone to move the plumbing and the location of the pump, and a few things like the auto vac line and the wiring to the deep end light got damaged along the way. He just lives up the road and keeps dropping in to check on things, including testing the water. He left his kit for me to use while I waited a few days for the refill to arrive after I noticed the discrepancy.

  8. Back To Top    #8

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Test discrepancy TA

    This is just a small hi-jack but it is certainly pertinent. Infrequently, we hear from folks worried about the uniformity of the drop size being dispensed from the dropper bottle.

    The size of the hole is irrelevant to forming a repeatable and acceptable drop.

    1. You must hold the dropper bottle vertically down. Do not tip it on it's side.

    2. The drop does not form inside the bottle to be magically dispensed. The drop forms on the rounded outside edge of the dropper tip and, when done slowly and correctly, it finally gets heavy enough to fall off the tip. Let it fall....do not force it off by pushing the liquid out too fast.

    3. A color change test is complete when the LAST drop you add makes absolutely NO COLOR CHANGE WHATSOEVER. Subtract that drop from the total and the test is complete.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  9. Back To Top    #9

    Join Date
    Jun 2015
    Location
    Akron Ohio
    Posts
    23

    Re: Test discrepancy TA

    +1 to what Dave said. You really, really have do drip slowly, let gravity pull the drop off the tip. Thanks to Dave, who gave me that advice, my test discrepancy is no more. Seriously let gravity do the work.
    30k IG concrete and fiberglass, 1HP Hayward Superpump, Pentair FNS plus 60 DE, Polaris 180, Taylor K2006 with TFTestkit refills, Stenner pump

  10. Back To Top    #10

    Join Date
    Jun 2011
    Location
    Carbondale, Illinois
    Posts
    62

    Re: Test discrepancy TA

    I re-did it extremely carefully and it did make a difference to 100 instead of 110. Other kit still reading at 60. I'm going to trust my TF-100 for now. The water looks great and I'm not going to mess with it.


    30k gal, IG plaster epoxy paint and stainless steel sides, built ~1980, sand filter, TF-100, SWG Circupool RJ-45, Dolphin M400.

  11. Back To Top    #11
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,999

    Re: Test discrepancy TA

    Good news! TA of 100 or 110 is not bad. We can work that down slowly if needed as summer goes on. Sometimes high TA causes PH to rise faster, so keep an eye on it and keep PH between 7.2 and 7.8. Adding muriatic acid to lower PH will gradually lower your TA until TA and PH reach equilibrium.

    Please add your pool info and location as shown here, Pool School - Getting Started, it will help us help you with better info about your pool and climate.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  12. Back To Top    #12

    Join Date
    Jun 2011
    Location
    Carbondale, Illinois
    Posts
    62

    Re: Test discrepancy TA

    Pool guy is outta my life now that everything is up and running. I ignored his suggestions and for about a week now everything is perfectly balanced with my TF-100 giving me a TA of 70. I'm a happy swimmer.


    30k gal, IG plaster epoxy paint and stainless steel sides, built ~1980, sand filter, TF-100, SWG Circupool RJ-45, Dolphin M400.

  13. Back To Top    #13
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,999

    Re: Test discrepancy TA

    Alright, good news! That's what we like.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

Posting Permissions

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