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Thread: Shock Level difference between poolcalculator.com and CYA / Clorine chart

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    Question Shock Level difference between poolcalculator.com and CYA / Clorine chart

    Good Morning Everyone,

    My SWG pool turned green and I am in the process of slamming the pool. Someone jumped my fence and turned off both my pump and swg (this has happened 2x this summer). I didn't notice this because I had just had some biopsies done and didn't check my pool for 3 days. Everything was programmed and running smoothly all summer long so I didn't worry about checking it while I was in so much pain.

    I used this chart to determine my shock level:
    Pool School - Chlorine / CYA Chart

    It says for a SWG pool with a cya level of 80 I should keep the chlorine level at 31.

    When I put all my numbers into the pool calculator online ( poolcalculator.com) it tells me to use " SWG: 4 Normal: 6 to 11 Shock: 21 Mustard Algae Shock: 42"

    Should I use the 21 the calculator recommends or continue to use the 31 the chart recommends?

    My Current Numbers are as follows:

    FC 32
    CC 0
    PH set to 7.2 before slamming
    TA 90
    CH
    150
    CYA 80
    Salt 3250

    Also, on a side note... I used the pool calc to determine my pool volume and it gave me the total of 11400 but Intex says it holds 10421 at 90% capacity. I have a 22x52 round ABG. Should I use the pool calc volume or Intex?????
    Intex AG 2252 / 10421 Gallons / Vinyl liner
    Pool Set up - May 2016
    2650 gal/hr Intex Krystal Clear Pump- Type B Filter
    Intex SWG
    TFTestkit / SpeedStir Magnetic Stirrer!!! / BBB method only

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: Shock Level difference between poolcalculator.com and CYA / Clorine chart

    Please use normal fonts.

    I would not use poolcalculator.com but PoolMath here on the site.

    Pool calculator is unmanaged and unreliable. PoolMath is updated regularly.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    JoyfulNoise's Avatar
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    Tucson, AZ
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    Re: Shock Level difference between poolcalculator.com and CYA / Clorine chart

    Quote Originally Posted by Deb_B View Post

    Also, on a side note... I used the pool calc to determine my pool volume and it gave me the total of 11400 but Intex says it holds 10421 at 90% capacity. I have a 22x52 round ABG. Should I use the pool calc volume or Intex?????
    I would use the Intex quoted volume and see how your chemical additions track with pool math. Even though Intex pools are "round", their sidewall profiles are not exactly straight and most volume calculators will assume a straight sidewall which is not at all accurate.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Shock Level difference between poolcalculator.com and CYA / Clorine chart

    Got it. So i'm staying with the 31 shock level per chem 201 and Intex''s 10421 for pool volume .

    I thought that the pool calculator was a tfp website. I've updated my bookmarks to pool math. Thanks!

    Deb

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    Join Date
    May 2016
    Location
    West Bloomfield, MI
    Posts
    630

    Re: Shock Level difference between poolcalculator.com and CYA / Clorine chart

    Quote Originally Posted by Deb_B View Post
    Someone jumped my fence and turned off both my pump and swg (this has happened 2x this summer).
    Your pool area is a great candidate for a web-accessible camera. Have you considered that? I have several. They're not expensive, they're very easy to configure and they offer great peace of mind. In simple terms, they detect heated motion. Swaying tree branches do nothing, but when the 14 yr old neighbor kid scales your fence to mess with your pump, or when a squirrel falls into your pool, you get an alert on your phone. Some models include not only a mic, but a speaker. The speaker allows to be hours away and still shout "hey, I see you! You're on video! Get out!"

    (or in my case, I can be in my office and shout, "hey you #@&%$ squirrel, stop chewing on my window sill!!!!")
    12,000 gal Diamond Brite indoor​ pool. Pentair Triton TR-60 Sand Filter +added DE, Lochinvar Energyrite ERN-200 gas heater, Pentair Multi-valve, Pentair SuperFlo VS pump, TF-100 kit, Pool Math App - iOS

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