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Thread: just shocked pool, FC at 10...is it safe to swim?

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    just shocked pool, FC at 10...is it safe to swim?

    Hi All! Here's a quick background on me...I just discovered this website today, and I'm so glad I did! I have been struggling for 2 years to keep our above ground pool safe to swim in and nice to look at. My previous method involved 6 way test strips, chlorine tablets, inadequate pump/filter, testing water at pool store, spending $100 at a time to fix problems I didn't understand, then throwing my hands up and draining/refilling the pool because it was cheaper and easier to start fresh!!

    So this year I upgraded my filter/pump system from the one that came with it, so I think that will be a big help. I still have a few "guess strips" left, but will be purchasing the TF100 test kit based on user recommendations and reviews.

    We refilled our pool yesterday after draining it because we let it get overrun by algae, not realizing that our old filter pump was broken. Before refilling, we scrubbed most of the algae off, but didn't vacuum it out 100%...I figured shocking the pool would take care of any residual contaminants. So, with a fresh 7600 gallons of (city) water, and a brand new sand filter system, we added 16oz. of Poolife Turboshock...78% Calcium Hypochlorite with 22% "other" ingredients last night at 9:00 p.m. Friday, May 27.
    This mornings readings were:
    FC: 10
    pH: 7.8
    TA: 80
    TH: 200
    CYA: 0 or 30-50

    It is 85 degrees out today, the water is beautiful and sparkling, and my 12 and 10 year old daughters want to jump in despite it being freezing! I read somewhere that it wasn't safe to swim in a pool when the FC was above 4. Is that true? When can they go in?

    I am reading and taking in as much as possible, but before my new test kit arrives, what is my best course of action to keep my pool beautiful? Can I use my remaining chlorine tablets (I only have 10 or so left), or should I immediately make the switch to bleach? Thanks in advance!!
    18' x 4' Round Intex Vinyl AGP ~ 7,600 Gallons
    Intex Krystal Kleer Sand Filter Pump ~ SF80110, 1/2 HP, 50 lb., 1600 GPH

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    pinguy's Avatar
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    Re: just shocked pool, FC at 10...is it safe to swim?

    Its safe if you have any CYA in the water. Why were you unsure of that result?
    Helpful Links: Pool Chemistry 101 - Recommended Levels - Recommended Chemicals - FC/CYA Chart - SLAM Instructions - Pool Math
    Test Kits:
    TF-100 - Taylor K2006 - SpeedStir Upgrade - Taylor K-1766 Salt Test
    My Pool:
    28k IG built May 2015 - Autopilot SWG - Pentair VS Pump/DE Filter/Heat Pump

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    Richard320's Avatar
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    Re: just shocked pool, FC at 10...is it safe to swim?

    With no CYA, or just a trace of residual from what was in the filter, 10 FC is going to be pretty harsh on skin and hair and swimsuits. The good news is, once the sun starts beating on the pool that FC will disappear. I wouldn't be surprised if you test it in four hours and find none left. Keep the kids out if you can until it dips to 5 or less.

    Save the pucks. As long as the bucket stays closed, they'll last for years. They're good to make up lost CYA due to splashout, but they dissolve too slowly to be used to raise CYA now. They're great for vacations.

    With a fresh refill and the only thing added was Cal-hypo, it's a safe bet CYA is zero. In which case, 2 lbs (half a 4 lb canister) will get CYA up to 32. 3/4 will get you to 48. Your choice.

    Pool School - Recommended Pool Chemicals will tell you what chemicals do what and how to add
    Pool School - PoolMath will teach you how to use poolmath to figure out how much

    PS: Welcome
    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: just shocked pool, FC at 10...is it safe to swim?

    Welcome to TFP

    You need some CYA in there to protect the FC and your kids and the liner...

    The pucks will work great for vacation and it would raise your CYA but 4 of them would also raise your FC 28 and you don't need that right now

    Make a trip to walmart and get the following

    pool isle
    HTH pool conditioner 100%CYA
    grab 5 bottles of liquid bleach "pool shock"

    go to lowes and grab the 2 gallon chemtech muriatic acid from the outdoor section

    using poolmath above add CYA to bring to 30 (1.5 pounds) put the CYA in a sock and kneed it in the pool water untill disolved
    let FC drift down to 4 and never let it get below 2 Pool School - Chlorine / CYA Chart
    drop your PH to 7.6 (4 oz MA)

    keep testing FC and PH until your test kit arrives, after that post back your numbers
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    Re: just shocked pool, FC at 10...is it safe to swim?

    Thank you for all your responses!! I just retested, and wouldn't you know it...FC now reads 0...Kids will be happy! I still have tons of reading to do, and will get the hang of this eventually. I will take all of your advice!

    I am unsure of the result because the difference between 0 and 30-50 range on the color key on the test strip is almost imperceptible. Maybe why they call them guess strips?!
    18' x 4' Round Intex Vinyl AGP ~ 7,600 Gallons
    Intex Krystal Kleer Sand Filter Pump ~ SF80110, 1/2 HP, 50 lb., 1600 GPH

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    Richard320's Avatar
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    Re: just shocked pool, FC at 10...is it safe to swim?

    Quote Originally Posted by Fedorable View Post
    Thank you for all your responses!! I just retested, and wouldn't you know it...FC now reads 0...Kids will be happy! I still have tons of reading to do, and will get the hang of this eventually. I will take all of your advice!

    I am unsure of the result because the difference between 0 and 30-50 range on the color key on the test strip is almost imperceptible. Maybe why they call them guess strips?!
    Exactly. And the difference between 30 and 50 is pretty substantial. That's about as useful as a tape measure only marked every 6 inches.
    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: just shocked pool, FC at 10...is it safe to swim?

    Welcome to the forum.

    Trying to follow what we suggest here with test strips for your test source is not productive. Trying to do it from the pool store is worse, I think.

    If you are serious about managing your pool (for example, your kids really shouldn't be swimming in that 0 Chlorine pool....you have no sanitation protection), I suggest you read "The ABC's of Pool Water Chemistry" up in Pool School. That'll teach you about chlorine and why it is THE most important additive to your pool.

    Come on and jump in with us. We'll hjel;p you every step of the way but you have to ditch those test strips and get the Taylor K-2006C kit or the TF-100. You can read more about them (and everything else) in Pool School.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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