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Thread: Testing CC

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    tlcottone's Avatar
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    Testing CC

    5 days ago I began the SLAM process. All during the SLAM I kept my FC at 20 (CYA is 50). All during this process, CC did not register at all. This morning the water was clear for the first time in days. I figured it was time to try the OCLT. FC was 17. At noon FC was 10 and for the first time since I started the SLAM, I got a CC reading of 1. My question is twofold. At what FC level does CC show up in testing and should I go back to SLAM again since the CC measured 1.
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    ship of fools's Avatar
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    Re: Testing CC

    Quote Originally Posted by tlcottone
    5 days ago I began the SLAM process. All during the SLAM I kept my FC at 20 (CYA is 50). All during this process, CC did not register at all. This morning the water was clear for the first time in days. I figured it was time to try the OCLT. FC was 17. At noon FC was 10 and for the first time since I started the SLAM, I got a CC reading of 1. My question is twofold. At what FC level does CC show up in testing and should I go back to SLAM again since the CC measured 1.

    I will answer one of the two folds .... YES you need to continue to SLAM .... keep at it until you meet all 3 criteria .... clear water, CC of .5 or less and passing the OCLT.

    You mentioned trying the OCLT but don't give results .... you need to measure after dark and then before the sun hits the pool.
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    Re: Testing CC

    CC shows up when it is there. It is constantly being created and oxidized during the slam process. The slam process is not complete until you pass the OCLT with a FC drop of 1ppm or less, your water is clear, and CC is .5 or less. All 3 criteria must be met before you allow the FC to drop below slam level. In order for the OCLT to be valid the sun must be off the pool when the samples are pulled. Dusk and dawn are the best times to pull your test samples.
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    Re: Testing CC

    Quote Originally Posted by ship of fools
    You mentioned trying the OCLT but don't give results .... you need to measure after dark and then before the sun hits the pool.
    During the SLAM process my FC never dropped below 15. I constantly kept it at 20 or slightly above. During this time, adding 5 drops of R-0003 never changed the color of water so I assumed that CC was 0. After water was clear this morning, I figured I would do OCLT test tonight after sunset. My 12 noon test showed FC of 10 and for the first time since doing the SLAM, CC registered. It only took 2 drops to clear water but that indicated a CC of 1. Which is why I was curious about at what FC level does CC finally show up in test results. I brought the pool back up to Shock level at 20.
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    Re: Testing CC

    Measuring your CC at noon simply indicated you have CC that the sun is going to drive off after the FC completes the oxidation of it. I think of CC as the kitchen garbage can. the FC going around the pool killing off the algae and other organics and it creates CC (garbage in a trash can) it shows up in tests until the can is taken out my Mr. Sun (the sun drives of the CC).

    If you do the OCLT stating tonight at 9:00pm and the re-testing tomorrow morning at 6:00am. If you have CC in the morning, it means you need to continue the SLAM. I used these times based on my sun patterns, you times may be different. If you do not have any CC, then you may have passed the OCLT, assuming you did not lose FC and your water is clear.
    -- Guy --
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    Re: Testing CC

    Guy I understand your points about CC, however I'm still curious as to why when my FC measured 15-20 the CC always measured 0? R-0003 didn't change the water back to pink until my FC measured under 15. For instance, yesterday I had FC of 17 and CC of 0 taken at noon. Today's noon test was 10 and 1.
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    Re: Testing CC

    As an added note, first test this morning was FC - 17.5 CC - 0. Second Test 16 / 0.
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    Re: Testing CC

    Guy I understand your points about CC,
    Well, not really. CC's are transient. Not uncommon for an algae pool to have O CC's and then develop CC's by the application of chlorine. Adding even more chlorine back in and the help of the sun rids your pool of these CC's but they can reappear anytime the FC has more organics to work on.

    When your CC's finally test at .5 ppm or less AND your FC holds overnight, that is the signal that the organics have been sufficiently consumed.....but you need both those signals in combination.
    Dave S.
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    Re: Testing CC

    Guy thanx and understood. 1:30 test shows FC-17 CC-0
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    Re: Testing CC

    The requirement that this happens at night is that it removes the sun's effect from removing the CC and the FC loses due to the sun. I see this like the kitchen garbage can getting garbage (CC) in it while you are sleeping. No one is removing it when you not looking, it just collects. Any FC lost overnight is indicates it was busy killing off algae and organics and converting them to CC ... even if you don't get a CC reading.
    -- Guy --
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    Re: Testing CC

    Guy so I can assume by your post that if FC/CC tonight is 20/0 and if an FC reading tomorrow am is less than 19 or CC reading greater than 0.5, then keep the SLAM going?
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    Re: Testing CC

    Quote Originally Posted by tlcottone
    Guy so I can assume by your post that if FC/CC tonight is 20/0 and if an FC reading tomorrow am is less than 19 or CC reading greater than 0.5, then keep the SLAM going?
    Your are correct, but missing one thing...your water should be crystal clear, which maybe it already is?
    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: Testing CC

    Quote Originally Posted by linen
    Your are correct, but missing one thing...your water should be crystal clear, which maybe it already is?
    Yes water has been crystal clear since this morning for the first time in days
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    Re: Testing CC

    Quote Originally Posted by tlcottone
    Guy so I can assume by your post that if FC/CC tonight is 20/0 and if an FC reading tomorrow am is less than 19 or CC reading greater than 0.5, then keep the SLAM going?
    Given you have clear water,

    If your test tonight is 20/0 and your test tomorrow morning is less 19 -OR- your CC is greater than 0.5 (two drops or more)..continue SLAM

    If your test tonight is 20/0 and your test tomorrow morning is between 19.0 and 20.0 -AND- your CC is less than 0.5 (one drop)... SLAM finished!
    -- Guy --
    10K gallons in 21' Round 52 inch wall Aqualeader AG, Hayward Power Flow LX 1.5 HP pump motor, Hayward Perflex EC50AC DE filter w/Cellulose, Wide mouth skimmer, 2013 new Diver Dan (craigslist) to replace the faded old Hayward AquaBug. TF-100

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    Re: Testing CC

    Quote Originally Posted by linen
    Quote Originally Posted by tlcottone
    Guy so I can assume by your post that if FC/CC tonight is 20/0 and if an FC reading tomorrow am is less than 19 or CC reading greater than 0.5, then keep the SLAM going?
    Your are correct, but missing one thing...your water should be crystal clear, which maybe it already is?
    I meant to say water not crystal clear is also a reason to keep going...but it sounds like you understood what i meant even if I said it wrong
    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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