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Thread: Clarification on shocking

  1. Back To Top    #1

    Join Date
    May 2011
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    British Virgin Islands
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    Clarification on shocking

    Hi everyone,

    I'm new to the website and i'm sure many have been in my shoes. I've previously checked the web for information on pools, found some good stuff and it would appear i've found some stuff not so good, so i'm not actually as good as i thought!

    Now i've found pool school and this website i'm very happy as you all seem to know what your talking about and i'm trying to take it all in as quick as possible.

    I look after a pool at the villa which is managed by the company i work for. Other then the few odd times i've never really had a bad time with Algae until recent which is partly my fault for not really knowing what i'm doing. Its certainly isn't a green swamp, but i have some large areas of green on the bottom.

    I would like some clarification on the shocking procedure. I have a SWG so i was going to use bleach to shock. I understand the FC needs to be relevant to the CYA (i've just added some chemicals today to adjust the CYA and will be ready to shock so wanted to make sure i'm doing it right)

    I add bleach to bring up the shock level and then it says to continue added every hour or so, is this because all the chlorine created by the bleach will be used up already? I have a taylor test kit so cannot test to high levels of chlorine, how can i tell i'm reaching the right levels without a higher tester? How much will a standard sized bottle of bleach rise the chlorine by if the pool is 13,000 or is that a impossible question to answer?

    I will try to get a full set of test results tomorrow (wed 25th)

    I thank you in advance and apologise for my lack of knowledge!!
    Regards

    Andrew

    British Virgin Islands, Caribbean.
    Freeform pools - 12,000 gallons
    DE Filter
    In Ground Pool
    Plaster
    Pump Info to follow

  2. Back To Top    #2
    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: Clarification on shocking

    Quote Originally Posted by bvipoolguy
    I add bleach to bring up the shock level and then it says to continue added every hour or so, is this because all the chlorine created by the bleach will be used up already?
    Yes. And as soon as the FC drops, the algae starts multiplying again. You need to keep on the offensive the whole time, or whatever you added already was for nothing.
    I have a taylor test kit so cannot test to high levels of chlorine, how can i tell i'm reaching the right levels without a higher tester?
    Order a FAS-DPD tester. You can read up to 50 ppm with it. If it's not available, even by mail order, in BVI, then you'll need to dilute your sample water with distilled water and multiply the results by an appropriate factor, which will not be very accurate.
    How much will a standard sized bottle of bleach rise the chlorine by if the pool is 13,000 or is that a impossible question to answer?
    Pool Calculator says "Adding 128 oz of 6% bleach will raise FC by 4.7 and raise Salt by 7.8. Bookmark that page. It's also able to work in metric.
    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!

  3. Back To Top    #3

    Join Date
    May 2011
    Location
    British Virgin Islands
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    Re: Clarification on shocking

    Thanks Richard.

    Just the information i was looking for. One more question for now if i may.

    On the chlorine/cya chart the SWG are listed with a higher CYA. Can you run a SWG at lower CYA like a non-SWG?

    Thanks for you help and fingers cross i can get rid of this algae and using the pool school create and keep a beautiful pool
    Regards

    Andrew

    British Virgin Islands, Caribbean.
    Freeform pools - 12,000 gallons
    DE Filter
    In Ground Pool
    Plaster
    Pump Info to follow

  4. Back To Top    #4
    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    SouthWest Alabama
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    22,337

    Re: Clarification on shocking

    You can run a swcg at normal CYA levels but you have to run it at a higher percentage and are therefore using up the cell faster. You're usually better off following the recommendations here and running the CYA a bit higher than for a non-swcg pool.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  5. Back To Top    #5

    Join Date
    May 2011
    Location
    British Virgin Islands
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    Re: Clarification on shocking

    Thanks guys, you've been a great help.
    Regards

    Andrew

    British Virgin Islands, Caribbean.
    Freeform pools - 12,000 gallons
    DE Filter
    In Ground Pool
    Plaster
    Pump Info to follow

  6. Back To Top    #6
    Richard320's Avatar
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    Jan 2010
    Location
    San Dimas, CA (LA County)
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    18,768

    Re: Clarification on shocking

    But what does the pool look like now?

    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!

  7. Back To Top    #7

    Join Date
    May 2011
    Location
    British Virgin Islands
    Posts
    22

    Re: Clarification on shocking

    It looks great again thanks Richard. I've had a few issues in the past, but confident I can keep on top of it all now. Of course unless we get another hurricane like last year! I had a tree break into the pool and dumped if I remember right, was about 5 trash cans of leaves into the pool!

    Would appreciate if you can could check out one of my other topics. Still looking for feedback on that overflow pool and now i've added photos and a plan.

    Cheers
    Regards

    Andrew

    British Virgin Islands, Caribbean.
    Freeform pools - 12,000 gallons
    DE Filter
    In Ground Pool
    Plaster
    Pump Info to follow

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