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Thread: where is my chlorine?

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    where is my chlorine?

    Greetings,
    I have dumped over a gallon of sodium hypo in my pool in the last day. I'm still reading 0 chlorine using my new TF-100 kit as of 7am. (Very fast shipping, great kit) I've even used my other kit and diluted the sample by 1/3 with nothing. I put in 90 oz. just yesterday. My water looks clear. Here's my attempted readings:
    FC 0
    CC how do I measure with 0 FC?
    CYA 0 Indoor pool, and that's why the hypo
    TA 250
    CH 300 range? very hard, my well water is bad.
    Is this possible and do I just keep adding 32oz every 4 hours? Also, can anyone tell me if I put in MA and my sodium hypo at the same time am I canceling anything out? How long after adding do I wait to swim? Lots of questions, appreciate the help.
    Thanks
    KW
    10,000 gallon
    Sand filter In-Ground, INDOORS, fiberglass
    45gpm,
    Heat set to 92 degrees, sodium hypochlorite
    Commercial Pool

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    Richard320's Avatar
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    Re: where is my chlorine?

    Hmmmm.....signature says chlorinator with pucks, test results show 0 CYA. That seems odd.

    Anyway, 90 oz of 6% should get FC to 3.6 in your pool. Since you have an indoor pool, you can rule out UV degradation, so that's a lot of loss, which leaves you facing an impending algae bloom. You need to read up on the shock process.

    Don't add acid and bleach together. Space them 30 minutes apart at least.
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    UnderWaterVanya's Avatar
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    Re: where is my chlorine?

    Acid plus bleach can react! Solid chlorines and acid can catch fire or even create an explosion. Unlikely in pool but as Richard said you need to space them out a bit.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    Re: where is my chlorine?

    Need to update my signature. I'm getting rid of the pucks because my cya was so high I drained my pool. To fix that problem I'm sparingly using my chlorinator. Otherwise I'm using up 68 gallons of sodium hypo that my predecessor bought. Think it's 12.6%
    Thanks for the MA info. I'm battling PH too. My battle plan is to add 32oz nightly of MA until I get the TA down to 120 since I have read high TA buffers my PH.
    My biggest problem is I need to avoid closing this pool if at all possible. I'm inspected by the state of Il. and if my FC is too high I have to close the pool. Then residents start complaining. The pool can sit empty all day and as soon as I shock it someone wants to swim. Is there a guideline as to how long after shocking people can swim? Looks like I'm coming in late tonight
    10,000 gallon
    Sand filter In-Ground, INDOORS, fiberglass
    45gpm,
    Heat set to 92 degrees, sodium hypochlorite
    Commercial Pool

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    UnderWaterVanya's Avatar
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    Re: where is my chlorine?

    Quote Originally Posted by riseandrun
    Need to update my signature. I'm getting rid of the pucks because my cya was so high I drained my pool. To fix that problem I'm sparingly using my chlorinator. Otherwise I'm using up 68 gallons of sodium hypo that my predecessor bought. Think it's 12.6%
    Thanks for the MA info. I'm battling PH too. My battle plan is to add 32oz nightly of MA until I get the TA down to 120 since I have read high TA buffers my PH.
    My biggest problem is I need to avoid closing this pool if at all possible. I'm inspected by the state of Il. and if my FC is too high I have to close the pool. Then residents start complaining. The pool can sit empty all day and as soon as I shock it someone wants to swim. Is there a guideline as to how long after shocking people can swim? Looks like I'm coming in late tonight
    What are your FC limits?
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    Mod Squad zea3's Avatar
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    Re: where is my chlorine?

    How high is too high according to the state of Il? Usually we say it is safe to swim up to shock level, but I don't know what your local health regulations are.
    TFP Moderator
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    Mod Squad jblizzle's Avatar
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    Re: where is my chlorine?

    You would likely still benefit from having a CYA of 20-30ppm. Not to protect the FC, but to buffer it and lower the active chlorine level. Then the FC will not be as harsh on skin and clothing.

    Posted from my Droid with Tapatalk ... sorry if my response is short
    Jason, TFP Moderator
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    Re: where is my chlorine?

    My upper limit is 5ppm. I just tested the chlorine again at 9:30am and I exaggerating when I say .5 That is to say I saw some pink when I added the reageant, but only looks like .5 I added another 40 oz. of LC and will check again around 1pm. My complete water exchange is 4 hours, it should be mixed by then correct?
    Thanks for the replies.
    10,000 gallon
    Sand filter In-Ground, INDOORS, fiberglass
    45gpm,
    Heat set to 92 degrees, sodium hypochlorite
    Commercial Pool

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    UnderWaterVanya's Avatar
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    Re: where is my chlorine?

    Quote Originally Posted by riseandrun
    My upper limit is 5ppm. I just tested the chlorine again at 9:30am and I exaggerating when I say .5 That is to say I saw some pink when I added the reageant, but only looks like .5 I added another 40 oz. of LC and will check again around 1pm. My complete water exchange is 4 hours, it should be mixed by then correct?
    Thanks for the replies.
    How old is the liquid chlorine. The higher concentration stuff loses strength faster than lower concentrations.

    Looks like a CYA of 20 would work well with a max FC of 5. It would be appropriate to have as low as FC=2 and you could dose up to 5 and let it drift down. I forget - do you have a liquid pump or other means to meter out liquid over time?
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    Re: where is my chlorine?

    You should be able to test in about a hour after adding with the pump running and adding it in front of the return jet....
    18x52 intex ultra frame pool 6981 gallons, 1 HP LL pump with 19 in sand filter,BBB method,borax 50ppm
    leslies DPD test kit + fas-dpd chlorine test kit + borates test strips
    thru wall skimmer,hard plumbed with 2 returns 1 1/2 sch 40 pvc
    1 large fountain 1 inch sch 40 pvc,shut off ball valves on all

  11. Back To Top    #11

    Re: where is my chlorine?

    The liquid chlorine could be a problem. It is sealed, but it could be a few years old based on what I've seen in the rest of this place. I really doubt that they rotated stock.
    I don't have a dispenser. I will diligently add 11 oz either first thing in the morning or at 6pm.
    10,000 gallon
    Sand filter In-Ground, INDOORS, fiberglass
    45gpm,
    Heat set to 92 degrees, sodium hypochlorite
    Commercial Pool

  12. Back To Top    #12

    Re: where is my chlorine?

    UWV you hit the nail on the head. I called the number on my shock to see if they would tell me expiration codes. 11213 means the majority of my shock was made around August of 2011. the 213th day of 2011. Any guesses as to if it's any good at all, or if I should double, triple, quadruple the dose......probably not.....
    I'm back to the chlorinator and pucks for the time being. Thanks all!!!
    10,000 gallon
    Sand filter In-Ground, INDOORS, fiberglass
    45gpm,
    Heat set to 92 degrees, sodium hypochlorite
    Commercial Pool

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    UnderWaterVanya's Avatar
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    Re: where is my chlorine?

    Quote Originally Posted by riseandrun
    The liquid chlorine could be a problem. It is sealed, but it could be a few years old based on what I've seen in the rest of this place. I really doubt that they rotated stock.
    I don't have a dispenser. I will diligently add 11 oz either first thing in the morning or at 6pm.
    What is the temp of the storage? Is it climate controlled? Is it out of the sun in opaque storage?

    Here's a chart showing the decay rates of 12.5% based on storage temps...

    As it decays to lower % it will not decay as fast. At worst you should be able to use this stuff once you have a feel for what the residual percentage is. If you dose and then measure and you get a FC level you'll be able to back into how effective it is acting. If for example you add a gallon and it acts like you added a quart - treat it like it was 1/4 strength for the next dose and see what happens.
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    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    Re: where is my chlorine?

    To answer your question about how to measure CC's do the following if you have the FAS/DPD test. First test the FC level and after the water goes from pink to clear you add 5 drops of reagent R-0003 and if the sample turns pink you have some CC's. Then continue adding drops of R-0871 until the water turns clear, each drop of R-0871 counts the same as the FC portion of the test. If you don't have any FC at the start of the test then add the R-0003 and see if the sample turns pink.

    When adding the MA to lower the pH make sure your pH doesn't fall below 7. Did not see if you are following TFP's way to lower TA.
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    Re: where is my chlorine?

    Thanks for all the responses! My "storage" room that the shock was in is not climate controlled. It's actually pretty warm. I do have a room not too far away that has A/C that would have been perfect. I'm only getting a few months supply next time and storing it there. UWV thanks for that chart. Based on the projectory I don't think there's any SH left!?!? 80 deg. or more and 350 days.
    10,000 gallon
    Sand filter In-Ground, INDOORS, fiberglass
    45gpm,
    Heat set to 92 degrees, sodium hypochlorite
    Commercial Pool

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    Mod Squad zea3's Avatar
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    Re: where is my chlorine?

    Get a 5 gallon bucket and fill it with chlorine free water. Add 1 tsp of your current chlorinating liquid and stir well. Wait 30 minutes and test. If it has at least 6% strength left it should raise FC to 10ppm.
    TFP Moderator
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    Re: where is my chlorine?

    How's this for a test. I took the chlorine only test tube from my TF-100 kit and used shock straight from the bottle and when I stuck a test strip in straight shock it read .5. Just to get rid of it I'm going to dump a gallon a day into the deep end. What a waste.
    10,000 gallon
    Sand filter In-Ground, INDOORS, fiberglass
    45gpm,
    Heat set to 92 degrees, sodium hypochlorite
    Commercial Pool

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    Mod Squad jblizzle's Avatar
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    Re: where is my chlorine?

    Hold on. Likely the test strip was bleached out by the VERY high FC ppm, so I doubt that test was correct.

    Am I right that 12% chlorine, would be 120,000ppm FC?
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  19. Back To Top    #19
    Administrator Leebo's Avatar
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    Re: where is my chlorine?

    http://www.ilga.gov/commission/jcar/adm ... 3200R.html

    If I'm reading this correct.....your legal limit is only FC of 4.
    1) Where chlorine is used as a disinfectant, the chlorine residual shall be maintained between 1.0 and 4.0 p.p.m. as free chlorine residual. A free chlorine residual of at least 2.0 p.p.m. shall be maintained when the pool water temperature exceeds 85 F.
    Is this an indoor or outdoor pool?? Have you talked to management about a SWG??

  20. Back To Top    #20

    Re: where is my chlorine?

    JB, you are correct my test probably was bleached out. I'm in the middle of making your mixture and will test shortly.
    Leebo, I don't know if your link was to an older version, or maybe I have old pool charts, but it says right on my paperwork between .5 and 5ppm. or I have to close the pool.
    I've gotten a new batch of shock and it's making a difference with my levels, but it seems like I need to add more often, or higher amounts because it doesn't last in my pool very long. I did notice from the link that if my temp is above 85 degrees my minimum should be at least 2 and this morning I was .75.
    thanks for the help. I feel like I'm finally getting a handle on this pool, but I'm spending more than a few minutes each day on it.
    10,000 gallon
    Sand filter In-Ground, INDOORS, fiberglass
    45gpm,
    Heat set to 92 degrees, sodium hypochlorite
    Commercial Pool

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