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Thread: Pool guy just shocked the pool...now what?

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    Shpigford's Avatar
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    Pool guy just shocked the pool...now what?

    We had the guys who installed our liner do a month of pool maintenance, and due to various circumstances our pool had to be shocked (it was a nice thick green). No clue what they used to shock...I did see them pouring in a liquid around the whole pool, so I assume it was some sort of liquid chlorine.

    At any rate, that also happened to be their last visit...meaning it's now up to me to take care of things.

    I've been reading Pool School and have the Taylor K-2006 test kit, so I'm not too overwhelmed as far as overall maintenance goes.

    But my question here, is how long do I let the "shock" settle before I attempt to balance chlorine/pH/etc?

    They did the shock Monday afternoon (it's now Tuesday evening). The pool is no longer green, but just really cloudy (can't see the bottom yet). So do I just wait till that settles? Or do I start doing anything in the meantime?

    My test results Tuesday evening were as follows (first time I've ever used the kit...so hoping I did it correctly):

    FC - 0.6ppm
    CC - 0.8ppm
    pH - 8.0
    TA - 60ppm
    CH - 140ppm
    CYA - Couldn't get a reading for this...the solution would never get cloudy
    22,000 gallon vinyl in ground with Hayward S244T sand filter and Hayward 3/4 hp Super Pump.

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    Richard320's Avatar
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    Re: Pool guy just shocked the pool...now what?

    You need to keep adding chlorine. And I suggest some CYA.

    Unlike humans and electricity, shocking is not a one-time deal. Read this article.
    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: Pool guy just shocked the pool...now what?

    Welocme to TFP...hate to say this, but you should fire the maint guys. They may have added some liquid chlorine, but shocking is not a one and done type of thing, it's a process. Sounds like they did not add any stabilizer (CYA) to you water either. You'll want to raise that to 30ppm and continue the shocking process.

    You have the kit, so you are armed and ready, but will need much more of that liquid chlorine

    Edit...I see Richard beat me to a reply...you may also want to read this and check out pool school (button on upper right of the page)
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Re: Pool guy just shocked the pool...now what?

    On the forum, "shock" is not a product but a process. Your process is not complete quite yet.

    Here's a laundry list....

    Lower your pH down into the low 7's like 7.2-7.4

    All your chlorine has been consumed. You will need to add more (tomorrow) and then re-add as chlorine is a consumable item.

    You have no CYA. You need to get some in your pool or your chlorine will be constantly consumed by the sun.

    Back to Pool School and Read "How to shock your Pool" and then post back questions.

    You're off to a good start but it will take a few days to finish the process.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Pool guy just shocked the pool...now what?

    I got beat to the punch, but ^^^^what they said.

    Like Richard is saying, your CYA is basically 0. You'll want to raise that to at least 20 or 30 to help protect the chlorine from the sun. I think your biggest problem right now is your pH, that's really high. You need to add some muratic acid to get that lowered to the 7.2 - 7.5 range. You should look at poolcalculator.com, you'll see that your FC level should never be below 2 with a CYA reading of 0, but since you have more than .5 ppm CC, you need to be shocking.

    You need to get your pool to 10 or 11 ppm FC and keep it there. Check it no less than twice a day until it starts to hold up. Keeping it at shock level will not just get rid of the green (which it sounds like you did), but will make it sparkling clear.

    See the link in Richards post and read through Pool School.

    -- Pete
    32x16 ft Grecian rectangular vinyl pool 8ft on deep end - 19000 gal. 18" Hayward S-240 sand filter. 250K BTU Pentair MasterTemp heater. Hayward 3/4 HP Super Pump.

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    Shpigford's Avatar
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    Re: Pool guy just shocked the pool...now what?

    So sounds like my biggest issue is CYA (or complete lack of). And seems from reading the Pool School articles, there's no quick way of raising it.

    So does that basically just mean I'll have to add a lot more chlorine a lot more frequently until the CYA levels get brought up?
    22,000 gallon vinyl in ground with Hayward S244T sand filter and Hayward 3/4 hp Super Pump.

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    JasonLion's Avatar
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    Re: Pool guy just shocked the pool...now what?

    With CYA really low you don't need as much chlorine.

    First lower PH down to around 7.4 or 7.5. While you are working on CYA, add 10 to 12 ppm of chlorine in the evening each evening.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Shpigford's Avatar
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    Re: Pool guy just shocked the pool...now what?

    Won't adding CYA lower the PH pretty significantly? Going to do a big buy of various chemicals today to get this under control and trying to figure out what all I'll need.

    According to the Pool Calculator, if I add ~120oz of stabilizer to help get my CYA to ~40, then that will lower my pH by about .75, which would be on target (meaning I wouldn't need to add any dry acid). Is that correct?
    22,000 gallon vinyl in ground with Hayward S244T sand filter and Hayward 3/4 hp Super Pump.

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    Re: Pool guy just shocked the pool...now what?

    Won't adding CYA lower the PH pretty significantly?
    Some, but the effect is longer term than you need. Get muriatic and lower it right away. DO NOT overlook the importance of chlorine. It's your single biggest issue.

    If you want to clear your pool, you need chlorine.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Shpigford's Avatar
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    Re: Pool guy just shocked the pool...now what?

    Thanks Dave.

    Jason mentioned adding 10-12ppm of chlorine...how do I calculate how much "10-12ppm" of chlorine that would actually be? The Pool Calculator says I need to add around 2 gallons of 12% liquid chlorine to get my FC up to 12, but not sure how what the Pool Calculator is saying plays into the "10-12ppm in the evening".
    22,000 gallon vinyl in ground with Hayward S244T sand filter and Hayward 3/4 hp Super Pump.

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    JasonLion's Avatar
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    Re: Pool guy just shocked the pool...now what?

    While CYA is near zero you lose essentially all of your chlorine to sunlight each day. That makes it most effective to add chlorine in the evening, since it at least gets the night to work before sunlight uses it all up.

    In more detail, what I meant was, measure your FC level, put that in the Now column for FC in the Pool Calculator. Put either 10 or 11 or 12 in the Goal column and have it calculate how much bleach you need to add, then add that much.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Pool guy just shocked the pool...now what?

    One gallon of 12% bleach will raise the FC by 12ppm in a 10,000 gal pool. So two gallons in a 22,000 gal pool makes sense. The reason Jason suggested the evening until you get CYA in the pool, is that it will give the chlorine a chance to do it's job overnight vs being burned up by sunlight during the day. CYA sheilds chlorine from UV/sunlight exposure.

    Edit...Jason types way faster than me...we're saying the same thing
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Shpigford's Avatar
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    Re: Pool guy just shocked the pool...now what?

    Gotcha. So as far as what I should do today...

    This morning I should go get the necessary chemicals to work on raising CYA and lowering my pH, then this evening, do a test and add the appropriate amount of chlorine. Then tomorrow, repeat, etc etc. Correct?
    22,000 gallon vinyl in ground with Hayward S244T sand filter and Hayward 3/4 hp Super Pump.

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    frustratedpoolmom's Avatar
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    Re: Pool guy just shocked the pool...now what?

    correct
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
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