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Thread: How often should I shock?

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    How often should I shock?

    I am sure this answer exists on the boards, but I just can't find it.

    My pool is running steady chlorine levels around 3. I run a frog system to maintain the level. Do I still need to shock it, and how often?

    Thanks.
    Jake

    24' Round Vinyl-lined AG, 14K Gal., Hayward Xstream 1500 Cartridge filter w/ powerflow Matrix pump, Hayward H200 Heater, plus one ribbit

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    Re: How often should I shock?

    Shock when you have a CC reading above .5
    27' Round AG, 17,200 gallons, sand filter

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    Re: How often should I shock?

    Welcome Jake.

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

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    frustratedpoolmom's Avatar
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    Re: How often should I shock?

    The Frog is making the rounds....
    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
    http://www.PerfectlyClearPoolService.com

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    ktdave's Avatar
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    Re: How often should I shock?

    Depends on what your water looks like and your combined chloramine (CC) level.

    Let us know what those are.
    11,000 gal. gunite w/midnight blue and white pearl PebbleTec
    Intelliflo 4x160 pump
    Intellichlor IC-20 SWG
    Pentair cartridge filter 420 sq. ft.
    Mastertemp 400K BTU heater
    Legend Platinum cleaner
    Pool School
    JasonLion's Pool Calculator
    TF Test Kits

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    Butterfly's Avatar
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    Re: How often should I shock?

    Hi jake0110,

    Lots of answers in "Pool School". Link located at the top of each page in the sub-heading and also in my sig.

    Welcome to the forum
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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  7. Back To Top    #7

    Re: How often should I shock?

    Thanks for the welcome guys. I checked out the pool school link, and I think I have my answer. Still, let me run my situation by you. Here is my info:

    I bought the pool last year, and the water quality has been great; clear, no odor. I check it frequently and I have a 150 gal saltwater fish tank, so I am used to balancing water chemistry. It is a 24' above ground pool, 14,000 gallons

    I use 4-way test strips. My current readings are:

    pH: 6.8 - i put in sodium bicarbonate this morning

    Free chlorine: between 1 and 3 ppm

    Total alkalinity: 120 ppm

    Stabilizer: near 0 ppm

    So..... should I shock every 10 days?

    Also, should I add chlorine stabilizer, even if the chlorine remains at a good level in the pool?

    Thanks again.....

    J
    Jake

    24' Round Vinyl-lined AG, 14K Gal., Hayward Xstream 1500 Cartridge filter w/ powerflow Matrix pump, Hayward H200 Heater, plus one ribbit

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    Re: How often should I shock?

    Hi, Jake,

    Welcome to the forum!

    Uh-oh! Back to pool school

    Read up on stabilizer in "ABC's of pool water chemistry". (you need some) and "BBB for beginners" and "how to balance your pool water"

    Also "search" "test strips" on the forum and you'll see why few of us like them for anything.

    Use Borax to raise your pH.....baking soda raises your Alk....you're a little too high already
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    frustratedpoolmom's Avatar
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    Re: How often should I shock?

    Sorry for my sarcastic comment before, I'm just not a fan of the Frog.

    Welcome to TFP. Before I answer your q's, I have a couple for you too!

    Is this a new pool?

    How are you testing your water? For example, are you using test Strips, is the pool store testing it?

    It's very unlikely that if your FC is running at 3, with tri-chlor, that your CYA is zero.

    I just want to clarify these two q's before we discuss shocking.

    Thanks!
    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
    http://www.PerfectlyClearPoolService.com

  10. Back To Top    #10
    frustratedpoolmom's Avatar
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    Re: How often should I shock?

    Oh I see - test strips.

    Let me know about whether this is a new pool?
    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
    http://www.PerfectlyClearPoolService.com

  11. Back To Top    #11
    ktdave's Avatar
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    Re: How often should I shock?

    Most importantly, I would suggest that you get a drop-based test kit such as the TF-100 sold by a TFP member duraleigh (http://www.tftestkits.com/) or the Taylor K-2006. The test strips are usually fairly inaccurate and hardly reliable for maintaining your pool chemistry.

    As far as shocking, in my opinion, it's not something done on a "schedule" but rather when necessary. For instance, I have yet to shock my 1 year old pool, just because my regular weekly (or daily) tests have indicated that I don't need to. You will be more closely in tune withyour pool chemistry if you have a drops-based test kit that includes:

    FAS/DPD test for chlorine
    pH test
    Total Alkalinity test
    CYA (stabilizer) test
    Calcium Hardness test

    yes, you need stabilizer.
    11,000 gal. gunite w/midnight blue and white pearl PebbleTec
    Intelliflo 4x160 pump
    Intellichlor IC-20 SWG
    Pentair cartridge filter 420 sq. ft.
    Mastertemp 400K BTU heater
    Legend Platinum cleaner
    Pool School
    JasonLion's Pool Calculator
    TF Test Kits

  12. Back To Top    #12
    frustratedpoolmom's Avatar
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    Re: How often should I shock?

    The instructions for the Frog tell you to shock 'every 2 weeks or more frequently' if hot weather and heavy bather load etc. There is a reason King tech tells you to do this.

    A properly balanced and maintained pool does not require routine shocking.

    Best advice I could give you is get the TF-100 test kit.
    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
    http://www.PerfectlyClearPoolService.com

  13. Back To Top    #13
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    Re: How often should I shock?

    Quote Originally Posted by frustratedpoolmom
    The instructions for the Frog tell you to shock 'every 2 weeks or more frequently' if hot weather and heavy bather load etc. There is a reason King tech tells you to do this.

    A properly balanced and maintained pool does not require routine shocking.
    It does if you want to try to maintain the pool with metals and .5 ppm FC!

  14. Back To Top    #14
    frustratedpoolmom's Avatar
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    Re: How often should I shock?

    Quote Originally Posted by waterbear
    Quote Originally Posted by frustratedpoolmom
    The instructions for the Frog tell you to shock 'every 2 weeks or more frequently' if hot weather and heavy bather load etc. There is a reason King tech tells you to do this.

    A properly balanced and maintained pool does not require routine shocking.
    It does if you want to try to maintain the pool with metals and .5 ppm FC!
    EXACTLY!!!!
    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
    http://www.PerfectlyClearPoolService.com

  15. Back To Top    #15

    Re: How often should I shock?

    OK. So I seem to have worked things out pretty well, thanks to your help.

    A couple of questions remain though:

    1. What is the difference between pH and alkalinity? The guy at the pool store offered an inadequate explanation.

    2. The pH increaser the store sells is Sodium Carbonate, but baking soda is Sodium BiCarbonate. What is the difference, and which one should I use?

    3. What's the deal with Borax? As above, the store sells Sodium Carbonate as pH increaser, but Borax is a different chemical.

    4. The store measured my Free Chlorine at 3.5, but Total Chlorine at 2.7. They do not measure Combined Chlorine. How can the TC be lower that the FC? How can I find out CC when the store cannot test for it?

    5. Finally, they suggested I use CYA to lower my Total Alkalinity. Is that the right answer?

    Thank you.

    Jake

    14,000 gal above ground pool
    I'll post other specs soon.....
    Jake

    24' Round Vinyl-lined AG, 14K Gal., Hayward Xstream 1500 Cartridge filter w/ powerflow Matrix pump, Hayward H200 Heater, plus one ribbit

  16. Back To Top    #16
    JasonLion's Avatar
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    Re: How often should I shock?

    1) pH is how acidic or basic the water is. This is the one you care about. TA is a measure of how much buffering there is in the water helping the pH stay stable. When TA is very low the pH can fluctuate wildly.

    2) Sodium carbonate is commonly called soda ash. It will raise pH quite a bit and TA some. Sodium Bicarbonate is commonly called baking soda. It will raise TA quite a bit and pH some.

    3) Borax, as in 20 Mule Team Borax, is a completely different chemical. It will raise PH quite a bit and TA just a little.

    4) The stores test results are just wrong. You should get your own high quality test kit and measure the levels yourself.

    5) No! Do not try to lower TA with CYA! There are instructions on lowering TA here.
    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

  17. Back To Top    #17
    frustratedpoolmom's Avatar
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    Re: How often should I shock?

    OMG find another pool store. They are useless, clueless and will steer you wrong.....
    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
    http://www.PerfectlyClearPoolService.com

  18. Back To Top    #18
    Ohm_Boy's Avatar
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    Re: How often should I shock?

    How can I find out CC when the store cannot test for it?
    There are three components to the chlorine content of a pool.
    There is FREE CHLORINE (FC) which is the chlorine available for use as a sanitizer
    There is COMBINED CHLORINE (CC) which is "used" chlorine, or chlorine which has combined with contaminants such as ammonia, sweat, etc.
    There is TOTAL CHLORINE (TC), which is simply the sum total of FC and CC.

    So if you know any two, you can determine the third.
    TC = FC + CC
    FC = TC - CC
    CC = TC - FC

    And I know it's been said, but you SERIOUSLY need to a) get your own test kit, and b) find another pool store. I mean, hey - I don't know the folks at your pool store, but they are certainly giving you bad advice. Real bad advice.
    [center:1kpalu48]Helpful Links: Pool School | CYA/Chlorine Chart | Pool Calculator[/center:1kpalu48]

  19. Back To Top    #19

    Re: How often should I shock?

    I did try to buy a more comprehensive test kit, but they didn't sell any with CC, so I passed.
    I will go find a new store.

    Thanks
    Jake

    24' Round Vinyl-lined AG, 14K Gal., Hayward Xstream 1500 Cartridge filter w/ powerflow Matrix pump, Hayward H200 Heater, plus one ribbit

  20. Back To Top    #20
    revstriker's Avatar
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    Re: How often should I shock?

    Quote Originally Posted by jake0110
    I did try to buy a more comprehensive test kit, but they didn't sell any with CC, so I passed.
    I will go find a new store.

    Thanks
    Even the big pool store chain near me does not have a decent (in my opinion) test kit for sale. I ordered mine (Taylor k-2006) online. Lots of members here use the TF-100 kit sold by duraleigh (a member here) and highly recommend both the kit, and the service that duraleigh provides. I know from ordering my Liquidator through him that he is very fast.
    10K White Plaster Pool Built in 2007. Hayward Pump and DE Filter, Hayward Navigator, Liquidator (Removed due to issues), Solar Blanket, BBB user.

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