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Thread: CC Level seems to be "stuck" at 0.5

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    CC Level seems to be "stuck" at 0.5

    Hi All,
    My cc has always been 0. ~30 days ago it seemed to creep up to 1.0 so i shocked it with 2.5 lbs of trichlor.
    dropped to 0.5 but not all the way to zero. shocked again with ~600 oz of 6% (household) bleach). went to 0 for a while but has since drifted back to 0.5.

    here are my other stats:
    Plaster,SWG, DE
    26k gallons
    TA: 100
    FC: (I normally keep it at ~7. it's still about 10 from my last shock on sat)
    CYA: 65
    Saline: 3000
    PH: keep it at 7.5 with MA (about 1g/week)
    last backwashed: ~3 weeks ago. pressure maybe 1 lb higher than post backwash.

    pool is clear and otherwise perfect except for this little 0.5 cc!

    anything i am missing? do i just live with this 0.5?

    thanks!
    Eric

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    Administrator Leebo's Avatar
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    Re: CC Level seems to be "stuck" at 0.5

    How often do you brush to pool? Do you have any pool lights it maybe behind?

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    dmanb2b's Avatar
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    Re: CC Level seems to be "stuck" at 0.5

    You likely did not shock your pool properly and long enough. Shocking with Trichlor is a really bad idea as it will raise your CYA and FC shock level.
    With CYA at 65, your FC shock level is about 25 and you have to hold it at that level until you pass the overnight FC loss test, the water is clear and FC is 0.5 or less.

    Liquid chlorine is your friend when shocking.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Mod Squad jblizzle's Avatar
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    Re: CC Level seems to be "stuck" at 0.5

    I would suggest reviewing the Shocking Your Pool process ... what you did was not what we recommend.

    Raise the FC up close to shock level for you CYA (~26 ppm FC) and perform the OCLT to see if something is lurking in your water. If you fail, do the shock process correctly.

    While 0.5ppm CC is usually fine, it sounds like this is not normal for your pool so could indicate something going on.
    Jason, TFP Moderator
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  5. Back To Top    #5

    Re: CC Level seems to be "stuck" at 0.5

    thanks!
    i thought i did it right...brought it up to what i thought was 25ppm FC.
    it's really hard to tell as the TF-100 seems to bleach out at these levels and i'm not sure how to read?

    with regards to the trichlor: my CYA was ~50 when i used that (and thought it woas a nice way to bring me back up a bit in the CYA and accomplish the shock). I will stick with the liquid chlorine from now on.

    I havent been brushing too well this summer. but i did do a thorough brush last weekend. didnt notice any algae.

    do you recommend taking the light off and looking behind? i've never attempted this in the past.

    BTW, pool is in its 3rd season.

    thanks!

  6. Back To Top    #6
    Mod Squad jblizzle's Avatar
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    Re: CC Level seems to be "stuck" at 0.5

    The TF-100 will easily read levels up to 50ppm. Likely you did not use enough of the powder to start with for the high FC levels.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Re: CC Level seems to be "stuck" at 0.5

    pool is clear and otherwise perfect except for this little 0.5 cc!

    anything i am missing? do i just live with this 0.5?
    .5CC test results should be treated the same as 0 CC's.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  8. Back To Top    #8

    cc @1.0

    hello again
    still having a litle cc issue.
    3 yr young SW pool. I normally keep FC in the 5-7 range and CYA ~60.
    a few weeks ago i noticed 0.5-1.0 cc so shocked it up to ~25 2x (once with trichlor and once with liquid).
    never did the OCLT but it stayed really higher for several days. cc seemed to stay at 0.5.
    tested again today. appears cc may be at 1 again.
    pool is clear and has been completely searched for algae and brushed several times this week.
    any ideas what the issue could be?
    any chance my TF-100 reagents/tools could be contributing? (i.e. the scoop i use to to the drop test is a little funky looking). I did change my reagents at the start of this year with a fresh supply.
    really just trying to assess if the problem may not be the pool at all.
    i'll do the OCLT tonight and see what happens.
    thanks!

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    linen's Avatar
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    Re: CC Level seems to be "stuck" at 0.5

    Quote Originally Posted by ewarren423
    i'll do the OCLT tonight and see what happens.
    Since you are measuring 1 CC still it is likely you needed to continue the shocking process that you previously started...it is a process not an event. So for your OCLT, I would raise the pool up to your shock level.

    The swg needs to be off while doing the OCLT.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: CC Level seems to be "stuck" at 0.5

    I doubt the reagents have anything to do with it. It might make sense to consider the reagents if you DIDN'T have any FC or CC reading. The fact that you do, indicates they are doing exactly what they are suposed to....detect the presence.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  11. Back To Top    #11

    Re: CC Level seems to be "stuck" at 0.5

    OCLT: 12.0 ppm @10pm......10.0ppm at 5am (2 ppm loss)

    just purchased the 13% chlorine and will bring her up to 28 ppm.

    let's hope i can break this thing!!!

    thanks for your help.

  12. Back To Top    #12
    linen's Avatar
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    Re: CC Level seems to be "stuck" at 0.5

    Make sure you follow the shocking process to the letter. You want to maintain your FC shock level until you pass all three criteria (simultaneously).
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: CC Level seems to be "stuck" at 0.5

    thanks!
    do i backwash at the start or after the process is over?

  14. Back To Top    #14
    linen's Avatar
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    Re: CC Level seems to be "stuck" at 0.5

    Backwash whenever your pressure goes up 25% from you "clean" pressure. If you do not know your clean pressure, do a long backwash making sure the backwash water goes very clear, then note your pressure once you are running in filter mode again.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  15. Back To Top    #15

    50%.

    i recently backwashed.
    clean pressure is ~13 and that is where she is now.
    didnt know if a backwash had to accompany the shock to completely "rid" the pool of any culprits.
    i will skip the backwash.

    just added the chlorine. my plan is to let the filter run until 11pm (4 hrs) then test.
    i will also test in the am before sunrise.

    is it safe to assume that if the 5am result is the same as the 11pm and if the cc is <=0.5 i'm good (water is already clear)

    if it lost some FC or has CC, i'll bring it back up to 25 by adding more Cl.

    i think i'll also keep my salt generator going during the day tomorrow. at the current temperature in the pool, it is
    ~50%. sound ok? should i adjust up or down?

    thanks again!!!

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    Re: CC Level seems to be "stuck" at 0.5

    The OCLT test requires that you not lose more than 1 ppm of FC. If you pass there's no sense running the SWG till your Chlorine levels drop close to your normal range. If you don't pass and want to supplement your bleach additions with the SWG go ahead but make sure when you do the OCLT again that it's off. Keep the pump running through the night. That way you can grab the morning test without waiting for the water to mix.
    Bill
    18'X4' 7600 Gal AG
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  17. Back To Top    #17

    Re: CC Level seems to be "stuck" at 0.5

    ok last night before bed it was 29ppm and this morning it was 26ppm.
    i added enough bleach to bring it back to 29 and put the SWG on 30%.
    came home from work and it was 18.5. Tested CC and it was 0.0
    my plan is to test it again tonight and tomorrow am and if it hold i'm good.
    i wasnt planning on bringing it back to ~28 tonight unless the experts (you guys) advise me to. my theory was the CC of 0 was a good sign and that i should see what the night brings. is this the right plan?
    if overnight doesnt hold, i'll bring her back to ~28.
    thanks again!

  18. Back To Top    #18
    Mod Squad jblizzle's Avatar
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    Re: CC Level seems to be "stuck" at 0.5

    3ppm is a significant drop overnight .... don't be discouraged it you do not pass again.
    Kind of surprised you lost as much as you did during the day with the SWG running as well.
    Keep it up.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  19. Back To Top    #19

    Re: CC Level seems to be "stuck" at 0.5

    silly question but do i need to get up and test it before sunrise (i.e. 5:30am) or can it just be before the sun reaches an angle that could cause significant rays hitting the pool? getting up at 6:30 or 7 is so much better!

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    Re: CC Level seems to be "stuck" at 0.5

    Later is just fine but do it before direct rays hit the pool.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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