Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 10 of 10

Thread: Unusual test results

  1. Back To Top    #1

    Join Date
    May 2015
    Location
    Fresno, CA
    Posts
    16

    Unusual test results

    This is a new one for me so I could use a little guidance here. I recently drained and filled our spa and have been trying to get the water in balance but I'm getting unusual ph readings from my test kits. The oto tests are reading around 8.0-8.2, yet I'm getting readings of around 7.2-7.5 on my test strips. I've used three different test strips and 2 different oto tests, one is from my tf 100 kit. All tests were performed within 5 min window, and all test materials used aged from 1 yr to a few months old. My normal inclination would be to trust the oto kit but based on my experience owning the spa for the last 6 years, the test strips would be more in line with what I would expect it to be. Other readings are as follows:

    Bromine - 5-7ppm (just shocked yesterday)
    Ta - 60
    Ch - 150
    Ph - ??

    Any ideas on what the heck is going on?
    21x 32ft inground pool, approx. 18-20,000 gal, Luna Quartz, Pentair Intelliflo vs pump, Pentair Cartridge filter, Pentair Sun Touch automation, Kreepy Krauly Sand Shark cleaner
    Hot Spot Malloca spa

  2. Back To Top    #2
    Mod Squad kimkats's Avatar
    Join Date
    Jul 2012
    Location
    Tallahassee, FL
    Posts
    26,699

    Re: Unusual test results

    How old is your TF-100 kit? How/where do you store it? Heat/cold/sun?

    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

  3. Back To Top    #3

    In the Industry

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

    Re: Unusual test results

    Use what you are calling "OTO". The test strips are likely the worst form of testing do not trust them. That pH test is called a phenol red test and is pretty standard for the industry. Unless you have left your reagent in the sun or outside for any real length of time, it is very dependable.

    (The other half of the comparator block is yellow drops for chlorine test and that's the OTO test.)
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    May 2015
    Location
    Fresno, CA
    Posts
    16

    Re: Unusual test results

    Thanks for the reply. Yes that is the test I'm referring to, with the phenol red dye. The tf kit and all other testers are kept indoors out of the sun. It is only 1-2 mos old

  5. Back To Top    #5
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: Unusual test results

    Stop using test strips and adding to your confusion. If you really want to compare the test strips to something then dip your finger in the water, hold it up to the wind and say the first number that pops in to your head. Test strips are completely useless. Taylor drop tests are the best in the industry.
    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

  6. Back To Top    #6
    Mod Squad kimkats's Avatar
    Join Date
    Jul 2012
    Location
    Tallahassee, FL
    Posts
    26,699

    Re: Unusual test results

    The "guess strips" are not worth the time to pull the water from the water. Use and trust your other test.

    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

  7. Back To Top    #7
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: Unusual test results

    Post a set of TF100 test results and we'll be glad to help.

    Are the test strips in the trash yet?
    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

  8. Back To Top    #8

    Join Date
    May 2015
    Location
    Fresno, CA
    Posts
    16

    Re: Unusual test results

    The test results above are from the tf100. I have three containers of leftover test strips that I occasionally use just for quick check of levels. They are never totally accurate but always very close for measuring ph and TA. This is the first time I've seen such a wide margin amongst drop test and strips, especially when 3 different test strips all registered the exact same. I get it though...I'll trust the Taylor test.

  9. Back To Top    #9
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: Unusual test results

    Ok, so hot tub maintained with bromine. Have you seen this handy bromine article for hot tubs?
    How do I use Bromine in my spa (or pool)?

    And add some acid to lower your PH to mid-7s.
    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

  10. Back To Top    #10

    Join Date
    May 2015
    Location
    Fresno, CA
    Posts
    16

    Re: Unusual test results

    Thanks. I have read that article. Very useful information.
    21x 32ft inground pool, approx. 18-20,000 gal, Luna Quartz, Pentair Intelliflo vs pump, Pentair Cartridge filter, Pentair Sun Touch automation, Kreepy Krauly Sand Shark cleaner
    Hot Spot Malloca spa

Posting Permissions

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