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Thread: sodium hypochlorite to shock my pool

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    sodium hypochlorite to shock my pool

    Hi

    I just emptied half my pool and refilled due to stabilizer levels. I believe I need to shock it and use algaecide but wanted to check if I can use Sodium Hyprochlorite and how much.

    My pool is 16000 Gallons.

    Thanks
    17500 Gallons, IG, Plaster, DE Filter, Built 1997, No Spa, Polaris 280

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    linen's Avatar
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    Re: sodium hypochlorite to shock my pool

    Welcome to tfp, onedah

    Spend a little time in pool school. The link is near the upper right of each page. Here is one article to start: http://www.troublefreepool.com/pool-...ater_chemistry

    Then post a full set of test results. See: http://www.troublefreepool.com/pool-...efore_you_post

    No need for algaecide if you use the methods taught on tfp. Sodium Hypochlorite is an excellent choice for chlorinating your pool. Use poolcalculator.com to calculate dosing.
    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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    Smykowski's Avatar
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    Re: sodium hypochlorite to shock my pool

    linen has you covered. I'll add this: Here at TFP we call it SLAMing, not shocking. There's an article for that in pool school, as well.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: sodium hypochlorite to shock my pool

    All,

    So I have read through the pool school articles and ready to switch. I went to Leslies this morning after following there instructions to empty half the pool. the CYA reading was 150. After emptying half the pool and refilling, I added 1 gallon of bleach and went back to Leslies. The below are the results from there test:

    FAC 0
    TAC 0
    CH 300
    CYA 120
    TA 80
    pH 7
    Pho 500
    Temp 80

    I am kind of lost on what to do next - The guy at Leslie told me add 2lbs of shock and then wait 2 weeks and see what happens to the CYA levels.

    Any advise would be most welcome. I will be purchasing the Test kits - but obviously will take a few days to arrive. Any idea's?

    Thanks
    Onedah
    17500 Gallons, IG, Plaster, DE Filter, Built 1997, No Spa, Polaris 280

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    pwrstrk's Avatar
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    sodium hypochlorite to shock my pool

    I find it hard to believe you drained half and refilled and CYA is still 120. What was it before the water replacement? Pool store has a bad habit of getting the CYA test wrong. You want your CYA level to be 30-50 ppm. I would get your FC level up to at least 2-3 ppm ASAP.

    When your test kit comes post a full set of results.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: sodium hypochlorite to shock my pool

    Leslie's can not test the CYA higher than 100ppm and they are not good at it. So certainly could have been up around 250 originally.

    Bottom line, you need to test it yourself with one if the recommended test kits and then find out how much more water you should replace.
    Jason, TFP Moderator
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    Re: sodium hypochlorite to shock my pool

    Quote Originally Posted by pwrstrk
    I find it hard to believe you drained half and refilled and CYA is still 120. What was it before the water replacement? Pool store has a bad habit of getting the CYA test wrong. You want your CYA level to be 30-50 ppm. I would get your FC level up to at least 2-3 ppm ASAP.

    When your test kit comes post a full set of results.
    The CYA was 150 according to the pool store before the replacement. how do you suggest I get the FC up - pool calculate suggests adding 1 gallon of bleach?
    17500 Gallons, IG, Plaster, DE Filter, Built 1997, No Spa, Polaris 280

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    Re: sodium hypochlorite to shock my pool

    In addition - is the pool safe to swim in? the water is clear.
    17500 Gallons, IG, Plaster, DE Filter, Built 1997, No Spa, Polaris 280

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    Re: sodium hypochlorite to shock my pool

    What ever it takes to get some FC in there so you don't have an algae bloom to deal with. Use bleach. Order the TF100. It will be a good investment.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: sodium hypochlorite to shock my pool

    I'd wait till you get some FC in there before I swim. 30 min after you add bleach you should be good to go.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: sodium hypochlorite to shock my pool

    Just put in over a Gallon of bleach - wont be swimming tonight but want to make sure I'm doing all the right things. I presume the test kit will take a few days to get here so any suggestions in the meanwhile?

    Thanks
    17500 Gallons, IG, Plaster, DE Filter, Built 1997, No Spa, Polaris 280

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    pwrstrk's Avatar
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    sodium hypochlorite to shock my pool

    How are you testing your water now ? If the pool store is your only way let them test for FC only. Just keep the FC levels up until your kit comes and post your test results and we can help you get things fixed.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: sodium hypochlorite to shock my pool

    I have a Pool Shop (pool & Spa Basic 5 Test Kit) at home. but I typically go to the pool Store for there advice.
    17500 Gallons, IG, Plaster, DE Filter, Built 1997, No Spa, Polaris 280

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    pwrstrk's Avatar
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    sodium hypochlorite to shock my pool

    Ok. Use that to check for FC. When your test kit comes you will be able to stop taking pool store advice. Our advice will be cheaper than theirs and better.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: sodium hypochlorite to shock my pool

    . but I typically go to the pool Store for there advice.
    You need to make a choice. The advice on this forum more often than not conflicts with pool store advice. If you try to blend the two, you end up in the middle not knowing what to do.

    Asking us to comment on pool store advice is counterproductive and really won't help you get your pool where it needs to be.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: sodium hypochlorite to shock my pool

    Time to get off that pool store merry-go round where your levels go up and down and you go round and round and the ride never stops. Eventually, you'll get sick enough that you'll jump off it.

    Get your own test kit. If CYA was 150 and you drained half and now it's 120, what does that tell you? It tells me the test results were wrong, which is more common than not.

    If the water isn't cloudy and green, you've got a huge jump start on these folks:
    first-time-shocking-with-bleach-t45074.html
    pretty-black-pool-t58442.html
    first-time-pool-owner-t61565.html
    a-little-encouragement-for-those-with-algae-and-new-to-bbb-t57137.html
    frog-filled-green-swamp-to-oasis-work-in-progress-t48213-20.html
    before-and-after-t36785.html
    a-final-picture-set-of-how-well-the-bbb-method-works-t33199.html

    They cleared things up. You can, too. You might notice they used sodium hypochlorite and their own test kit. Might be a pattern, here....

    [center:30p3g7vz][/center:30p3g7vz]
    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: sodium hypochlorite to shock my pool

    Went out this morning to take a reading with my basic test kit (waiting on the TF100). The pool store told me I had no Chlorine in the pool - however my test shows I have and its around 2 (FC). Water looks clear. however I did see some algae on the walls on one side of the pool - There is not a lot but I believe this was from last week where I did not totally scrub the algae off.

    Should I try and remove all the green off the wall and keep adding Chlorine until the kit arrives (it feels like these little spots of algae are hard to get off)?

    Thanks again for all the help. (have to say I was a little skeptical of how difficult it would be to do the testing using the TF100 kit, however watching the videos makes me feel a whole lot better)

    Thanks
    Onedah
    17500 Gallons, IG, Plaster, DE Filter, Built 1997, No Spa, Polaris 280

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    Re: sodium hypochlorite to shock my pool

    With your likely still high CYA and visible algae, it would be a good plan to put in a gallon of Clorox each evening and brush the spots when you can. That should hold any further algae development and may help on the existing spots you have as well.

    Once your kit gets in, please do a complete set of tests (it'll be time consuming on the first go-round) and then post them up.

    While you're waiting, make sure you have a good grasp on the SLAM process and be ready to have plenty of bleach on hand.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: sodium hypochlorite to shock my pool

    Thanks Dave, just finished scrubbing and removing all the algae off the walls, will drop a gallon of bleach this evening. I presume kids are still safe to swim?
    17500 Gallons, IG, Plaster, DE Filter, Built 1997, No Spa, Polaris 280

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    Re: sodium hypochlorite to shock my pool

    Quote Originally Posted by onedah
    Thanks Dave, just finished scrubbing and removing all the algae off the walls, will drop a gallon of bleach this evening. I presume kids are still safe to swim?
    From what you have posted the kids should be fine. The kit you have will give you basic levels, FC = 1-5, which is fine for the high level of CYA you probably have. The pool calculator will show you how much adding a gallon of bleach will affect your FC so you will have an idea of what to expect as a cross check until your test kit arrives.
    16,500 gallon, 18" x 38" Grecian; IG Vinyl, Hayward DE

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