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Thread: Confusing tests and levels

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    Join Date
    Aug 2014
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    Round Rock, Texas
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    Confusing tests and levels

    Hi

    I am a fairly new pool owner. We filled the pool Aug 24,2014. I have been lurking here since I found the site and go through posts and pool school topics. I still have a lot to learn and am working through pool school still. I received the tf-100 test kit about 2 weeks ago. In the past two weeks I have only added 2 gallons of conditioner. No chlorine or MA has been added. Today I added 2 pounds of soda ash because of PH reading.

    Here are the numbers from today:

    FC 17
    CC 0
    TA 20
    CH 575 (we have extremely hard water)
    TC > 5
    PH < 6.8
    CYA 30

    I am confused on how my numbers are so out of range. I ran all the tests twice to confirm since they were so out of whack. The SWG was set to 60% so I turned it down to 40%. We did get about an 1.5" of rain last week. Water temp is about 62 degrees.

    Could this just be an anomaly or something to be concerned with? If it is something to be concerned about, what should I do? Thanks in advance.
    17k IG SWG plaster pool
    Filled with water 08/23/14
    Pentair 160332 Clean & Clear Plus - 520 sq. ft.

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    JasonLion's Avatar
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    Re: Confusing tests and levels

    Welcome to TFP!

    Your FC level is way too high. You need to take care of that right away because the high FC level may be interfering with the PH test.

    Turn off the SWG for a day or two, and when you turn it back on turn it down to about 20 percent. After a day with the SWG off, the FC level should come down below 10. If it doesn't, leave the SWG off for another day.

    Once the FC level is below 10, test the PH and adjust as needed to get the PH to be between 7.0 and 7.8.

    After the PH is back in range, test and adjust the TA to bring TA up to at least 60. However, adjusting the PH might take care of this.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Confusing tests and levels

    Thanks for the suggestion. I turned the swg off and will test a little more often until numbers are back to normal.
    17k IG SWG plaster pool
    Filled with water 08/23/14
    Pentair 160332 Clean & Clear Plus - 520 sq. ft.

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    Patrick_B's Avatar
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    Re: Confusing tests and levels

    Welcome to TFP!

    Let us know how it goes.
    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

  5. Back To Top    #5

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    Re: Confusing tests and levels

    Work was insane last week and I am just now getting back to the pool.

    Today's numbers

    FC 8
    CC 0
    TC 8
    CH 650
    TA 40
    CYA 30
    PH 7.8-8.2 (I have trouble with red colors)

    SWG has been turned off since it was suggested and I can't smell chlorine like I could before. I did pool math and to get TA up from 40 to 60 add 80oz of baking soda. I think I will test again tomorrow and add baking soda if needed at that time. I am also leaving the SWG off a little longer to get chlorine more in range. I am also going to hold off adding conditioner for a couple more tests.

    Is that approach too conservative?
    17k IG SWG plaster pool
    Filled with water 08/23/14
    Pentair 160332 Clean & Clear Plus - 520 sq. ft.

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    Re: Confusing tests and levels

    What did you do to move pH from less than 6.8 to around 8.0? I can't see where you added anything to do that.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad zea3's Avatar
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    Re: Confusing tests and levels

    There shouldn't be a problem with adding the CYA now. Pretty soon the water will be too cold for the SWG to generate chlorine if you are not heating the pool, but you want it to be ready in the spring when the water warms back up. As long as you keep the chlorine in range for your CYA it should be fine.
    TFP Moderator
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    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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    Re: Confusing tests and levels

    Quote Originally Posted by duraleigh View Post
    What did you do to move pH from less than 6.8 to around 8.0? I can't see where you added anything to do that.
    I added about 2 or 2 1/2 pounds of soda ash. Didn't measure it, just eyeballed it.
    17k IG SWG plaster pool
    Filled with water 08/23/14
    Pentair 160332 Clean & Clear Plus - 520 sq. ft.

  9. Back To Top    #9

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    Re: Confusing tests and levels

    Thanks for the info on the water temp and swg. I didn't know that. I went and read some posts on that after you said it and the water is probably too cold now. At least it feels too cold. I think I will just leave it off and dose manually until the spring.
    17k IG SWG plaster pool
    Filled with water 08/23/14
    Pentair 160332 Clean & Clear Plus - 520 sq. ft.

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    Re: Confusing tests and levels

    I would suggest you use PoolMath for your additions. Have you seen it in the upper center-left portion of your screen?

    "eyeballing" is a sure bet to start chasing your numbers wondering why they are "confusing".
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  11. Back To Top    #11

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    Re: Confusing tests and levels

    Quote Originally Posted by duraleigh View Post
    I would suggest you use PoolMath for your additions. Have you seen it in the upper center-left portion of your screen?

    "eyeballing" is a sure bet to start chasing your numbers wondering why they are "confusing".

    I found PoolMath this morning which is how I came to to 80oz of baking soda for TA. I know I shouldn't eyeball it, but I was frustrated which is no excuse.
    17k IG SWG plaster pool
    Filled with water 08/23/14
    Pentair 160332 Clean & Clear Plus - 520 sq. ft.

  12. Back To Top    #12

    Join Date
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    Location
    Round Rock, Texas
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    Re: Confusing tests and levels

    Here are the latest numbers

    FC 5
    CC 1
    CH Didn't check
    TA 70
    CYA 55
    TC 5
    PH 7.8

    Things seem to be coming into line.
    17k IG SWG plaster pool
    Filled with water 08/23/14
    Pentair 160332 Clean & Clear Plus - 520 sq. ft.

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