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Thread: did i go overkill on shock?

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    did i go overkill on shock?

    My fiance and i just bought our first house last year. Lucky us, it had a 37,000 gal pool! So this is our first year opening. we were having some issues with algae upon opening. I did some research and decided to go with the TFPC method for maintaining the pool. picked myself up a Taylor K-2006 test kit and decided to go ahead and shock the pool. After some initial test i saw that my numbers were about spot on (cya, pH, etc..). I see that vinyl liner pools require about a 15 ppm to shock. i calculated to be about the right amount of bleach to take me from my initial 2.8 ppm to 15 ppm to kill this stuff dead. an hour later i tested the water about an hour later and realized i had overshot! i ended up with approx 18 ppm after shocking. am i in any danger of damaging my liner by running this high of a PPM for a short time to shock? obviously I'm going to let it lower for a while and not add any more chlorine. but if this chlorine level sits like this for a day or 2, am i in trouble? should I be looking to add a neutralizing chemical asap? or am i just overreacting like a pool newb?

    any advice would be great! thanks guys

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    Mod Squad JohnT's Avatar
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    Re: did i go overkill on shock?

    Welcome to TFP!

    If you have algae, your chlorine won't stay at 18ppm for long. Probably already much lower than that.
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    Richard320's Avatar
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    Re: did i go overkill on shock?

    Welcome!

    No, 18 FC is not going to damage anything, provided your CYA is around 40.

    For future reference.... you can do the FC test using 10 ml of water. That way each drop is .5 instead of .2. It speeds it up and saves a lot of the R-0871 reagent. Also, Taylor is much like coffee companies. They tell you to use far too much of their product each time. One scoop is usually enough powder. If you have one or two undissolved crystals, that means you have enough. Somehow they dissolve during the test.
    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.
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    Re: did i go overkill on shock?

    Welcome to TFP!

    Your FC level alone doesn't tell us much without also knowing your CYA level. Depending on your CYA level, 18 could be way to high, just right, or not enough. Where did you see that vinyl liner pools require 15 FC to "shock"?

    If you wouldn't mind, could you post your full set of test results?

    FC
    CC
    pH
    TA
    CH
    CYA

    Also, if you are following the TFPC method (and it is a great method to follow), you should know we don't serve Shock around these parts. We only keep SLAM on tap.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
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    Re: did i go overkill on shock?

    Welcome to TFP! Follow the TFP methods and advice and you will be swimming before you know it.
    Can you post a full set of numbers?
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

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    Re: did i go overkill on shock?

    Wow, you guys are great! such quick responses! i had seen on e a few other pool forums that people recommended vinyl liner pools be around 15ppm when shocking to avoid possible damage (probably conservative).

    full numbers:

    FC = 2.4
    CC = 2.8 (transposed these in my first post)
    pH = 7.6
    TA = 100
    CH = 230
    CYA = 35

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    Re: did i go overkill on shock?

    Quote Originally Posted by edub370 View Post
    Wow, you guys are great! such quick responses! i had seen on e a few other pool forums that people recommended vinyl liner pools be around 15ppm when shocking to avoid possible damage (probably conservative).

    full numbers:

    FC = 2.4
    CC = 2.8 (transposed these in my first post)
    pH = 7.6
    TA = 100
    CH = 230
    CYA = 35
    Use the chart here for you SLAM level http://www.troublefreepool.com/conte...art-slam-shock

    - - - Updated - - -

    Get your FC back up to SLAM level. The longer it is below SLAM level the longer it will take.
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

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    Re: did i go overkill on shock?

    holy cow. just tested again. and within the 3 hours that its been shocked its dropped to around a 5-6 ppm! i didnt even know that was possible! is a 12ppm drop in a 3 hour span normal under heavy algae conditions?

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    Richard320's Avatar
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    Re: did i go overkill on shock?

    Quote Originally Posted by edub370 View Post
    holy cow. just tested again. and within the 3 hours that its been shocked its dropped to around a 5-6 ppm! i didnt even know that was possible! is a 12ppm drop in a 3 hour span normal under heavy algae conditions?
    Yep. And if any CYA converted into ammonia, it'll use up bleach almost as fast as you can pour it in. Your high CC numbers sort of hint at that. The good news is that as things start to die off, the thirst decreases.
    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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    Re: did i go overkill on shock?

    and here i was worrying about my 18ppm lol

    ^^^ freakin newb

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    Re: did i go overkill on shock?

    Relax. You are fine. You will learn a ton as you go through your slam. Keep asking questions!

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    Re: did i go overkill on shock?

    next question, when testing with my taylor k-2006 kit, when i start adding droplets to check my FC, i'm supposed to add until the water goes from pink to clear. well i can get the water to go to clear, but when i let the water sit for a minute or 2 without swirling after that, it starts changing back to pink. does that mean i need to add more droplets, or am i just letting it sit around too long? really makes my confidence in what im reading from the kit go down.

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    Re: did i go overkill on shock?

    It is a vary common question. Once it sits it is normal for it to turn back to pink. Once the drop you add to turn clear is in the that is your count. Don't add more.
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

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    Re: did i go overkill on shock?

    welcome edub, once you have done all the tests a few times, you will have more confidence in the results and your ability to interpret them. here are some videos of the tests being performed if you are interested:

    https://www.youtube.com/watch?v=vYBEt1rzkeU k-2006 video

    https://www.youtube.com/user/TF100TestKit/videos TFTestkits videos
    32,000L Fibreglass Leisure Pools IG 12.5'x23'x5' Pump: AstralPools BX1 1.0HP
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    Re: did i go overkill on shock?

    Quote Originally Posted by edub370 View Post
    and here i was worrying about my 18ppm lol

    ^^^ freakin newb
    Everyone was new at some point so don't beat yourself up too much! I was just reading a thread yesterday where someone put so much bleach in their pool that their FC was in the 80s. So you see, it could be much, much worse.

    Welcome to TFP!
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    Re: did i go overkill on shock?

    haha i guess it could be worse

    thanks again for the quick responses. u guys have really helped me out a ton!

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    Mod Squad tim5055's Avatar
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    Re: did i go overkill on shock?

    Quote Originally Posted by edub370 View Post
    haha i guess it could be worse

    thanks again for the quick responses. u guys have really helped me out a ton!
    Well, great advice so far so I guess about all I can say is welcome to TFP!
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: did i go overkill on shock?

    Quote Originally Posted by edub370 View Post
    haha i guess it could be worse

    thanks again for the quick responses. u guys have really helped me out a ton!
    since your FC is dropping so fast, raise your FC above the SLAM level. if your SLAM level is 15ppm, take it to around 20ppm. that way you spend more time at or above 15ppm. if you take it to 15ppm, the levels aren't staying there very long and its gonna take more time to finish. im not saying go to 30, but some extra helps a lot. the idea is to NEVER allow the FC to drop below your SLAM level, only way to do that is constant additions of FC, or raise it higher.

    I would take it to 20ppm, as soon as it gets to 15ppm, raise it again to 20ppm. eventually the FC loss slows down and you can bring it a bit lower.
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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    Re: did i go overkill on shock?

    Quote Originally Posted by DaninFLA View Post
    im not saying go to 30, but some extra helps a lot. the idea is to NEVER allow the FC to drop below your SLAM level, only way to do that is constant additions of FC, or raise it higher.
    I took it to 30, probably more than 30 for brief moments before the ammonia sucked it dry. My first 5.5lbs of CYA resulted in test results of 0. Once I had every bit of leaf, trace of silt and spec of dust out of the pool I attacked. I brought PH down, got calcium and CYA up and Dumped enough bleach to get up above 30. I waited until after sunset to give my bleach the best chance at surviving. Its working. If my pool wasn't so deep, I think it would look clear to anyone else.
    26000 gallon Kidney shaped gunite pool. Older pool with deep dive well, nice diving board and tall slide. 31" Hayward pro sand filter with Pentair 1.5hp pump. Testing with the TF-100 plus test kit. Using a Dolphin Nautilus pool cleaner robot, next to bleach, my pools best friend.

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    Re: did i go overkill on shock?

    You can test for ammonia with a fish tank ammonia test kit.

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