Become a TFP Supporter Pool Math Forum Rules Pool School
Page 1 of 2 12 LastLast
Results 1 to 20 of 21

Thread: Is 26.5ppm chlorine (free) adequate to shock?

  1. Back To Top    #1

    Is 26.5ppm chlorine (free) adequate to shock?

    Cuz I just dumped in 5 gal of 12%, and after circulating all night, pool is still green, but not as bad, but still, should 26.5ppm re enough to kill the algae? If not, I will dump in another......
    All other parameters are good.

    Thnaks!
    16,000 gal in ground, marcite. FL.

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    Quote Originally Posted by noquacks
    All other parameters are good.
    We are not the trusting type Please post all you "good" parameters so we can give informed suggestions.

    There is no way to know what your shock FC level is without knowing your CYA level.

    Have you read this:
    pool-school/defeating_algae
    and this:
    pool-school/shocking_your_pool

    Because it does not appear you are following the shocking process.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  3. Back To Top    #3

    Join Date
    May 2009
    Location
    Dallas, TX
    Posts
    781

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    Just to add to the above good advice...

    Shock value as well as normal operating FC level is dependent upon CYA. Therefore, you will need a reliable CYA value to determine an adequate shock value.

    Test strips *may* be better than nothing, but are far from reliable. In the absence of the standard, the Taylor CYA turbidity test, your next best choice may be the pool store until you receive your TF-Test kit in the mail...
    20K gal IG plaster pool, Manually chlorinated with 6% bleach, 1.5 HP Sta-Rite Dura-Glas II pump, Pentair FNS Plus 48 DE filter, Polaris 280

  4. Back To Top    #4
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    Adding to what jblizzle and Beez said, please read this article: http://www.troublefreepool.com/pool-...efore_you_post
    It really helps us help you!
    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.

  5. Back To Top    #5

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    Thnaks, People! So much advice so quick! I will read those links as soon as I post this quick note. FWIW, Yes, I didnt post my parameters, nbut the pool service store yesterday tested my water. They said everything is within limits, so why does it have to be "proven". Anyway, time to raead above as you suggested- maybe I'll learn something......
    16,000 gal in ground, marcite. FL.

  6. Back To Top    #6

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    OK, all 3 links read- yes, I read fast. Also, helps if you understand most of the terminology. Now, people, I dont have the actual #'s, which I understand are helpful, but assuming all is in order, is 26+ppm high enough, or not?

    All I know is pH is 7.4, calcium is withing limits, Ive been told (250ppm+??). Alkalinity is "within". Cyanuric acid- they didnt tel me yesterday, so I dont know. But, I have been good with my tablets al along, which helps that, right? Now, people, no problem- I can get them a sample again tomorrow, if we cant figure it out.
    16,000 gal in ground, marcite. FL.

  7. Back To Top    #7

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    The Cl value of 26.5ppm was obtained by titration.
    16,000 gal in ground, marcite. FL.

  8. Back To Top    #8
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    Quote Originally Posted by noquacks
    FWIW, Yes, I didnt post my parameters, nbut the pool service store yesterday tested my water. They said everything is within limits, so why does it have to be "proven".
    So often pool store results are inaccurate. Since that is what you have at this point, please post them. Your question: "Is 26.5ppm chlorine (free) adequate to shock?" can not be answered with out them. In the end you will benifit greatly from you own test kit (see link in my sig).
    Quote Originally Posted by noquacks
    Anyway, time to raead above as you suggested- maybe I'll learn something......
    You will find tons of useful info in poolschool.

    I am curious, you have 63 posts on here and have not heard that we need test results to help you?
    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.

  9. Back To Top    #9
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    Quote Originally Posted by noquacks
    OK, all 3 links read- yes, I read fast. Also, helps if you understand most of the terminology. Now, people, I dont have the actual #'s, which I understand are helpful, but assuming all is in order, is 26+ppm high enough, or not?

    All I know is pH is 7.4, calcium is withing limits, Ive been told (250ppm+??). Alkalinity is "within". Cyanuric acid- they didnt tel me yesterday, so I dont know. But, I have been good with my tablets al along, which helps that, right? Now, people, no problem- I can get them a sample again tomorrow, if we cant figure it out.
    Yep, you definitely need your own test kit, the pool store results are not adequete. I prefer the tf-100. Using tablets invariably ends up raising you CYA (cyanuric acid) level too high, which in turn requires more chlorine to sanitize and do the "shocking process". We can not help you much until you have a reliable number for CYA. Get that test kit!
    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.

  10. Back To Top    #10
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    Quote Originally Posted by noquacks
    Cyanuric acid- they didnt tel me yesterday, so I dont know. But, I have been good with my tablets al along, which helps that, right?
    These statements make me worry. If you have always been using tablet then I am guessing your CYA is too high (the danger of the easy-to-use tablets). They probably did not tell you because the tests usually peg at 100ppm.

    Look at this chart here:
    pool-school/chlorine_cya_chart_shock

    To shock at 26.5 FC your CYA would have to be around 65ppm ... and you have to HOLD it that high adding CL as often as possible.

    HOWEVER, when we see people on here that use tablets the CYA is generally above 100ppm ... up to 300+ ppm.

    At CYA of 100ppm the shock level is a FC of 39ppm ... and with CYA even higher it becomes almost impossible to keep the FC high enough to shock and then to maintain the required normal levels.

    When the CYA is too high the only option is partial/complete drain and refill.

    THIS is why we have to have all the #s. And generally it has been seen that pool store #s can be pretty far off, thus the recommendation to have your own test kit.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  11. Back To Top    #11

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    OK, I get it. I have "trusted" pool stores too often. Time to get the #'s. A little knowledge can be dangerous, I suppose. Will try to get back here tomorrrow. Thnaks, People!
    16,000 gal in ground, marcite. FL.

  12. Back To Top    #12
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,349

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    We will beat on you pretty good about the numbers, but please believe that it's in your best interest.

    Once you understand the FC/CYA relationship thing you'll understand why we couldn't answer your question.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  13. Back To Top    #13
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    Quote Originally Posted by noquacks
    A little knowledge can be dangerous, I suppose.
    Yes, Yes, very dangerous to those nasty organisms
    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.

  14. Back To Top    #14

    Join Date
    Oct 2011
    Location
    New Caney, Texas
    Posts
    414

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    Congratulations linen!
    18' x 42" Intex (4786 Gal @ 80% capacity) Intex 8110 SWCG, 2000 GPH cartridge filter.
    Full Sun, Well Water, Borates at approx. 50
    TFTestKit-100--The Pool Calculator--Pool School

  15. Back To Top    #15
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    Quote Originally Posted by George N
    Congratulations linen!
    Thanks George...please let me know if I get out of line!
    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.

  16. Back To Top    #16

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    OK, Leslie pool results:
    Free Cl: 10 (I got 26+ppm, already theyre wrong), still 10 they say is "high"
    Ca hardness: 200ppm (I dont get this- is it as Calcium OR as calcium carbonate?big difference. Still, I am "normal")
    Cyanuric: 50ppm
    Alk: 80 (low borderline)
    pH 7.4

    But today, they tell me Cl wont "kill" algae, so I need to spend $$ on Bromide. OK, I buy the bromide and they say add 2 capfuls for my 16,000 gal pool (yesterday they sold me $31 worth of phosphate remover).

    So, people, here I am. Oh, today, pool a tad clearer. Still lt green. Sand filter. Takes time, I suppose. Has been that wway for years.

    Thnanks!
    16,000 gal in ground, marcite. FL.

  17. Back To Top    #17
    maxepr1's Avatar
    Join Date
    Mar 2011
    Location
    DFW
    Posts
    716

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    CL won't kill Algae...huh thats new one! PhosFree, take it back.
    40'x19' IG Diamond Brite 29K 4' Waterfall/Dive Rock FNS60 DE Inteliflo VS 2hp Whisperflo pumps Aqualogic(P4) SWG TF100 Tester


    Pool School, Pool Calculator,TFTestKits,

  18. Back To Top    #18
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    If you want to save money ... stop going to the Leslies.

    CL will kill algae ... that is the whole point of it in the pool. And if you keep the FC at the correct levels ... phosphate levels DO NOT MATTER.

    The good news is that your CYA level MAY (if you trust their test) be reasonable. If you believe the 50ppm then the shock level is FC of 20 ppm {this just goes to show what the PS understands ... In their mind 10 is too high, so if you stay below that, the algae will stay and then they can sell you more stuff ... BTW I do not think the test they use even goes ABOVE 10 so that means it must be high right }

    Keep the FC above 20ppm as much as you can and the pool will clear up without adding anything but bleach.

    At some point you have to decide if you are going to follow Leslies' advice or learn to understand your pool and follow the advice you find here.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  19. Back To Top    #19
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,349

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    First, stop buying stuff from the pool store that you don't need! Phosphate remover and Bromide, you don't need! All you need is chlorine!

    With a CYA of 50 your shock level is 20. Get it there and keep it there till your pool is clear and passes the OCLT.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  20. Back To Top    #20

    Re: Is 26.5ppm chlorine (free) adequate to shock?

    Thanks, people. I had a suspicion, but you trust people. Guess I am Ok right now. Takes some time but my filter will work/clear it up.
    16,000 gal in ground, marcite. FL.

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •