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Thread: Does Sodium hypochlorite (12.5) raise cya?

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    Does Sodium hypochlorite (12.5) raise cya?

    I've been using sodium hypochlorite in lieu of Dichlor to try and get a fc reading. I do use trichlor during day to supplement it but my cya seems to be rising too fast. I was under impression liquid chlorine didn't raise cya. I know trichlor does but it's not enough to raise this fast. Cya 80, fc 0, tc1, ph 6.8, ta 70. Cya was 40 about a month ago. What's the deal?
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    JasonLion's Avatar
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    Re: Does Sodium hypochlorite (12.5) raise cya?

    Liquid chlorine (sodium hypochlorite) does not contain any CYA. Trichlor and dichlor both do contain CYA. I would expect trichlor to take just over a month to raise CYA by 40 in normal usage.
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    Re: Does Sodium hypochlorite (12.5) raise cya?

    How much liquid chlorine would one normally add in the morning rather than trichlor pucks in a 21,000 gallon pool? I've been putting 2.5 gallons in weekly and pucks in during the day. I do not use any dichlor.
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    Re: Does Sodium hypochlorite (12.5) raise cya?

    Quote Originally Posted by Bobswe
    How much liquid chlorine would one normally add in the morning rather than trichlor pucks in a 21,000 gallon pool? I've been putting 2.5 gallons in weekly and pucks in during the day. I do not use any dichlor.
    Have you used the PoolCalculator.com yet? It will figure you doses for you.

    But, with a CYA of 80, your FC should be between about 6 and 11, and never below 6.

    [s:49usisa7]What % liquid chlorine are you asking about?[/s:49usisa7]
    Assuming 12.5% liquid chlorine, to raise FC from zero to 11, you would need to add about 230 ozs (or, 1 gal, 3 qts, + 3 cups).
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    Re: Does Sodium hypochlorite (12.5) raise cya?

    That seems like an awful lot to add each day, as well as expensive?
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    Re: Does Sodium hypochlorite (12.5) raise cya?

    Quote Originally Posted by Bobswe
    That seems like an awful lot to add each day, as well as expensive?
    Well, that is enough to take FC from ZERO to 11 ppm. How many ppm FC does your pool lose each day on average? You may only need to add about 3 or 4 ppm, which would be about 63 to 84 ozs.
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    Re: Does Sodium hypochlorite (12.5) raise cya?

    Six cups of 12.5% liquid chlorine is equivalent to one 7 oz trichlor tablet.
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    Re: Does Sodium hypochlorite (12.5) raise cya?

    Thank you, I'll start tracking.
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    Re: Does Sodium hypochlorite (12.5) raise cya?

    Starting to use liquid chlorine solely. When would be best time to add to pool if I usually run filter 10 hrs a day usually during the daytime hours, However, it is often that I'll run filter 2 hrs extra during the evening for circulation.
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    Re: Does Sodium hypochlorite (12.5) raise cya?

    The pool calculator says shock level for a pool showing a cya needs to be held at a fc reading of 21. Having algae with clear water should take about how long to rid it of the cc reading? Im just looking for aprox. 1 day, 2 days? I know to continue until it starts to hold on itself but was looking for aprox.
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    Re: Does Sodium hypochlorite (12.5) raise cya?

    Quote Originally Posted by Bobswe
    The pool calculator says shock level for a pool showing a cya needs to be held at a fc reading of 21. Having algae with clear water should take about how long to rid it of the cc reading? Im just looking for aprox. 1 day, 2 days? I know to continue until it starts to hold on itself but was looking for aprox.
    No way to predict - too may variables. How green is the pool? How much organic debris? How good is the circulation? How religious are you about replenishing lost FC? How religious are you about brushing? How thorough are you about getting back behind the light?

    Bare minimum, 3 days. One poor guy here a while back took almost a month to finally pass the overnight test.
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    Re: Does Sodium hypochlorite (12.5) raise cya?

    Wow. Can algae really hold on that long? My Water has stayed clear. I do see some algae forming along seem that i brush off. I inderstand what youre saying about the work that's involved. I never seem to get full blown algae maybe because I have some metal readings that I try to contain with pro team metal magic. I work long hours but am home from dusk til dawn. I've used liquid chlorine to try and shock several times this year but not sustained over days. In doing it once a week I have not "really schocked" the way it needs to be but always wait for liner to restain. Having a cya that's slowly rose to 80-90 finally made me stop with trichlor as of yesterday. Does the liquid chlorine have to work harder due to the metal sequestriant also?
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    Re: Does Sodium hypochlorite (12.5) raise cya?

    Quote Originally Posted by Bobswe
    Does the liquid chlorine have to work harder due to the metal sequestriant also?
    Chlorine will break down the metal sequestrant. If it's EDTA-based, it will result in a noticeably higher chlorine demand. If it's HEDP-based, as recommended on this forum, then you probably won't notice the difference in chlorine demand.
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    Re: Does Sodium hypochlorite (12.5) raise cya?

    Yes it is, it's pro teams metal magic.
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    Re: Does Sodium hypochlorite (12.5) raise cya?

    And being as I'm on sequestriants, when's the best time to put that in when I'm schocking. Currently I put in once a week but should I do 24-48 hrs prior to schocking?
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    Re: Does Sodium hypochlorite (12.5) raise cya?

    ProTeam® Metal Magic is HEDP so is probably not contributing very much to chlorine demand. As for when to add it, I would add it when the chlorine level is normal and not at shock levels (so not the same time you are shocking). Though HEDP is chlorine resistant, it does slowly break down from chlorine so there's not much sense in using it at the same time. If you want to make sure metals are being held well when you are shocking, then yes add the metal sequestrant a day or two before you shock, but if you find that shocking doesn't lead to new staining, then adding your maintenance dose after shocking has returned to normal FC levels would be better (in terms of not breaking down HEDP as quickly).
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    Re: Does Sodium hypochlorite (12.5) raise cya?

    I'm 2 days into my shocking with liquid chlorine. They sell it at bj's so I bought several cases. I've been shocking at or a little above 21ppm consistantly. Today I vaccuumed to waste any algae fallout and it has not reaccumulated yet. I hope to pass overnight test soon as I go away saturday. I've noticed that u cannot check for cc when chlorine is so high, is that the reason u need to pass the overnight chlorine test to know you're algae free. The other question I have is I need to use a solar cover when I go away as I'm surrounded by trees. I want to avoid any trichlor so can liquid chlorine go in under the cover near a jet. I'll be gone 7 days and my daughter may take cover off here and there but it will mainly stay on. I swore off trichlor so prefer to continue with the liquid chlorine (12.5). Any suggestions?
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    Re: Does Sodium hypochlorite (12.5) raise cya?

    Assuming you've killed everything (and there may be some spores on that cover, you might want to soak it in the pool) and your daughter can be taught to check the level and add a little, no problem. You won't lose very much if the cover blocks the sun.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: Does Sodium hypochlorite (12.5) raise cya?

    How soon after I know algae is gone can I start using pro teams metal magic again. I have some slight staining of liner but going thru with shocking treatment until I do it right.
    Southern NJ, 1 HP Haward Pump, 16x 32 dimensions, 21,000 gallon vinyl liner inground pool, TF-100 test kit.

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    Re: Does Sodium hypochlorite (12.5) raise cya?

    Quote Originally Posted by Bobswe
    ...I've noticed that u cannot check for cc when chlorine is so high, is that the reason u need to pass the overnight chlorine test to know you're algae free...
    You can check for CC at any chlorine level. It's part of the OCLT test and is routinely tested at shock levels. It's the PH test that reads falsely high when Chlorine levels are at 10 ppm and above.
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