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Thread: New at self testing and have a few (just curious) questions

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    Join Date
    Jul 2015
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    Tampa, Florida
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    10

    New at self testing and have a few (just curious) questions

    I finally bought the tf-100 test kit and it arrived yesterday. I did my first round of full tests to see how it worked, and all seemed fine except for two readings which were MUCH higher than the pool store tests. Results were: FC 11.5; CC 0; TA 120; CH 725; CYA 85.

    The two that are so much different are the FC (pool store kept telling me between 4 and 6 for the last several months) and the CH (pool store kept telling me between 400 and 450 for the last several months). Those seem to be big jumps!

    My CH has always been high. Talking with other pool owners from my part of FL, they have told me it is because of the hard water coming out of the taps! I do not have scaling problems, and other pool owners (and the pool store) do not seem too concerned, so I have not been too concerned.

    I do have a bit of staining, but that is a question for a different forum. (I actually think that reading through the staining forum has helped me know a plan to solve that problem)

    I am also using pucks currently, but after a trip that I am taking next week, I will switch over to liquid when I return. Will also plan a partial water exchange when I get back to try to lower the CYA.

    So, my questions -- Are results this wildly different from the pool store normal and expected? Should I be worried about High CH reading? If yes, what is the best way to solve that, knowing that the water coming from the taps could be the problem?

    Enjoying being part of this community! I have already learned a lot just from reading!
    15000 gallon IG marcite; Sta-rite PXC75 w/ 75 sq. ft. cartridge filter; Pentair 3/4 hp pump; no idea what age the pool is (we've been in the house for almost 2 years); used to have a heater which we removed as it did not work; tf-100 test kit.

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    Patrick_B's Avatar
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    Jun 2011
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    Midland TX
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    Re: New at self testing and have a few (just curious) questions

    Welcome to TFP and kudos for taking over your pool.

    Yes, this is expected unfortunately, we see it all the time. Your CH is high, but manageable. Depending on your tap water, you can likely reduce it some. With high CH it's important not to let the pH get too high, so try not to let it get above 7.6 for now. CH comes from the tap, and you can test it to see what's in yours. Lots of people have hard water, so it's a matter of managing it carefully to prevent scaling. No worries, it can be done. Enjoy your time on the forum.
    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

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    Join Date
    Aug 2013
    Location
    Arab, Alabama
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    Re: New at self testing and have a few (just curious) questions

    Quote Originally Posted by michaelpdough View Post

    So, my questions -- Are results this wildly different from the pool store normal and expected? Should I be worried about High CH reading? If yes, what is the best way to solve that, knowing that the water coming from the taps could be the problem?
    You are correct, pool store testing can be, and often is wildly inaccurate. You don't mention a pH, but yes a high calcium can be a problem. Problems like scaling can be avoided by properly balancing your water to offset the high Calcium.

    Sorry Patrick! What Patrick said...
    39YO 13K gallon former SWAMP/MONEY PIT, concrete bottom/Fiberglass Walls, Ecotech VS pump, Hayward Sand Filter, Dolphin DX5 Plus, Loop-Loc safety cover and YES, I have a TFT-100 test kit!

    Shock Level and Maintain - CL/CYA Chart

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    Join Date
    Jul 2015
    Location
    Tampa, Florida
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    10

    Re: New at self testing and have a few (just curious) questions

    pH was 7.8, but I have treated to lower it. I tested my tap water and CH level there is 350, so a swap is not going to do that much. I am going to try to divert some rain water and see if that will lower it. Florida rains are here every day!

    What should I be looking for with the scaling? Will I see it on the bottom or at the edges?
    15000 gallon IG marcite; Sta-rite PXC75 w/ 75 sq. ft. cartridge filter; Pentair 3/4 hp pump; no idea what age the pool is (we've been in the house for almost 2 years); used to have a heater which we removed as it did not work; tf-100 test kit.

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    Richard320's Avatar
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    Jan 2010
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    San Dimas, CA (LA County)
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    18,768

    Re: New at self testing and have a few (just curious) questions

    Scale will appear in areas with poor circulation first. Look for tan or greyish patches and a rough surface that feels like 400 grit sandpaper.
    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!

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