Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: CH test

  1. Back To Top    #1

    CH test

    I did this test today and it did't change colors. Do I continue one to the next step in adding drops until it changes to blue?
    ____________________________________________________________ ______________________
    In the process of building a Lonestar Fiberglass Pools : Savannah in Caribbean Blue. 13,000 Gallons SWG, 4 therapeutic jets, Pentair 1 HP superflow (348023) pump, 200 Clean & Clear cartridge filter (CCRP-160353), Pentair salt cell IntelliChlor IC40, 3 LED lights, 1 skimmer, cantilever coping with integral light wheat color, and salt-rock pool decking finish.

  2. Back To Top    #2

    Join Date
    Aug 2010
    Location
    Dallas, TX
    Posts
    4,052

    Re: CH test

    Look through this, from the extended test kit directions.

    CH - Calcium Hardness


    Rinse the sample tube with pool water.
    Fill the sample tube with pool water to the 25 ml mark. The top of the sample will be curved. This curve is called a meniscus. The bottom of the meniscus should be level with the 25 ml mark.
    Add 20 drops of R-0010 and swirl to mix.
    Add 5 drops of R-0011L and swirl to mix. The solution should turn red, pink, or blue. If the sample turns blue, you are done and your CH level is zero.
    Counting the number of drops as you go, add R-0012 one drop at a time, swirling to mix after each drop.
    Continue adding drops until the color changes to something more or less blue. If the sample turns purple see the note on "fading endpoint" below.

    Continue adding drops as long as the color continues changing. The final drop, that does not change the color any further, does not count.

    If the sample starts to turn blue and then goes back to red/pink and stays there from several more drops this is also a "fading endpoint", see the note below.

    Multiply the number of drops by 10 to get your CH level. Remember that the final drop, which didn't cause any further color change, doesn't count.
    Dispose of the sample safely. It is best to pour it down the drain with the water running. Do not add it back to the pool.
    Rinse the sample tube with tap water and store for next time.

    Notes

    Hold the dropper bottles vertically and squeeze gently, so that drops come out slowly and seem to hang on the tip of the dropper bottle for a moment before falling.
    If you expect that your CH level is extremely high, you can do the test so that each drop is 25, instead of 10, to speed up the process and save on reagent usage. Use 10 ml of pool water, 10 drops of R-0010, 3 drops of R-0011L, and multiply the number of drops of R-0012 by 25 to get your CH level.
    Measuring high CH levels is much easier and more precise if you use a magnetic stirrer.
    The sample may turn purple during the test, or go to blue for a moment and then turn back to red/pink. This is called a "fading endpoint" and is caused by interference from metal ions. If this happens, do the test again, but this time add five drops of R-0012 before adding any R-0010 or R-0011L. Remember to count the initial five drops in the total.
    In extreme cases, a fading endpoint may occur even when adding five drops of R-0012 at the start. If that happens, mix pool water with an equal quantity of distilled water, test that, and then multiply the result by two.
    R-0010 is calcium buffer, a strong base which prevents interference from magnesium.
    R-0011L is calcium indicator, an organic dye used to provide the red/blue color. It should be a deep blue color. If the dye stains the plastic bottle it is stored in, it has gone bad.
    R-0012 is hardness reagent, used to titrate until the color changes.
    The precision of the measurement is plus or minus one drop when up to 10 drops of titrant are used, or plus or minus 10% of the final reading, when more than 10 drops of titrant are used.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
    If TFP has helped you, please click to SUPPORT TFP!

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,333

    Re: CH test

    When you say it didn't change colors. Do you mean it stayed clear?

    If it stayed clear your R-0011L is probably bad. If it went immediately blue you have zero CH.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  4. Back To Top    #4

    Re: CH test

    Stayed cleared....I haven't had the TF-100 kit even a month. Think it could be bad?
    ____________________________________________________________ ______________________
    In the process of building a Lonestar Fiberglass Pools : Savannah in Caribbean Blue. 13,000 Gallons SWG, 4 therapeutic jets, Pentair 1 HP superflow (348023) pump, 200 Clean & Clear cartridge filter (CCRP-160353), Pentair salt cell IntelliChlor IC40, 3 LED lights, 1 skimmer, cantilever coping with integral light wheat color, and salt-rock pool decking finish.

  5. Back To Top    #5
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768
    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!

  6. Back To Top    #6

    Re: CH test

    Richard - the link takes me to a page that tells me I am unauthorized to view this forum.
    ____________________________________________________________ ______________________
    In the process of building a Lonestar Fiberglass Pools : Savannah in Caribbean Blue. 13,000 Gallons SWG, 4 therapeutic jets, Pentair 1 HP superflow (348023) pump, 200 Clean & Clear cartridge filter (CCRP-160353), Pentair salt cell IntelliChlor IC40, 3 LED lights, 1 skimmer, cantilever coping with integral light wheat color, and salt-rock pool decking finish.

  7. Back To Top    #7
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,333

    Re: CH test

    What color is the R-0011L? Deep Purplish blue or something else?

    PM Dave about it and I know he'll make it right.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  8. Back To Top    #8
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: CH test

    Quote Originally Posted by TK13LG
    Richard - the link takes me to a page that tells me I am unauthorized to view this forum.
    Oops. The short version is that Taylor had a bad batch of R-0011L, and if you bought it from tftestkits, they'll make it right.
    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!

Posting Permissions

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