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Thread: liquid chlorine 20-22% - is this possible?

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    liquid chlorine 20-22% - is this possible?

    I live in an area without a pool store. I've been looking for a more concentrated bleach than the 6% at Walmart so I called around & found a pool supply store about 40 mins away who said the percentage of sodium hypochlorite is 20-22% - is that even possible (I've never heard such a high percentage). I asked him a couple of times just to make sure we were understanding each other & he assures me it's correct. With gas prices the way they are right now I don't want to make a wasted trip. He quoted me $12.98 for a 4 gallon case which is way cheaper than anything else I've found. Am I right to be skeptical or did I stumble upon a liquid chlorine gold mine!?
    ~Susie
    27500 gal inground vinyl lined pool
    Pentair Clean & Clear Plus cartridge filter
    Pentair Whisper Flo 1HP pump

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    I've not heard of a percentage that high and my guess is, like most things like that, it's too good to be true. I pay 15.00 for 5 gallons of 12.5% so yours is obviously a deal if the percentage is correct.
    Dave S. - Forum owner
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    Mod Squad JohnT's Avatar
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    Never heard of that concentration, but you are close to many chemical manufacturing plants. It's conceivable that the higher concentration may be feasible when close to the manufacturing point, but that's just a guess.
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    20K Gallon 20X36 Vinyl Inground
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    JasonLion's Avatar
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    Possible, yes. Likely, no. The highest concentration I have seen is 15%. Keep in mind that the self life falls very quickly at higher concentrations. For example 15% at room temperature will turn into 12.5% in about two weeks. 22% would need to be refrigerated or used in the first few days, or it wouldn't be worth it.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    [EDIT] Whoops, I wrote this the same time as Jason. [END-EDIT]

    It is possible, but the shelf life of concentrated chlorine declines rapidly with higher concentration -- roughly by the square of the concentration. The table at the end of this link shows how the half-life (the time it takes to lose half of its concentration) of 20% chlorine even at 75F is 70 days. The fastest loss occurs during the earlier part of that time period. A loss of 10% of the concentration, going from 20% to 18%, happens after just 10 days and that's assuming 75F temperature.

    Probably the best thing to do is to get some of this chlorine and try it in your pool assuming the 20% concentration is correct (so use half the dose of what would be done with 10%). Measure your FC level in the pool before you make the addition and around 20-30 minutes after you've made the addition, assuming your pump is running and you have decent circulation (you can measure in two spots -- near where you added it and at the other end of the pool). That will tell you the true concentration assuming your pool volume measurement is accurate.

    Even if $12.98 for 4 gallons were for 12.5% chlorinating liquid, this would be equivalent to $1.20 for a 96-ounce jug of 6% bleach so is a pretty good deal unless you can get bleach on sale for $1.

    Richard
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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    High concentration bleach degrades quickly due to trace metal concentrations that are left it during manufacturing.

    If you are going to keep a supply of it around it is best to just stick with the 6% or 5.25% -- it will likely be your cheapest form when you factor in the loss due to just sitting around.
    20x40 IG vinyl, heatpump and solar and 3 siberian huskies, 10kw PV solar electric system. Nikon Photographer D800e dSLR.

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    Thanks for all the replies. I called the pool store back again & spoke to someone else. I was told that the liquid chlorine would be between 10-12%. That sounds more like it. Don't know what that guy was talking about before.

    The cheapest I could find more concentrated bleach for was $3.14 for a gallon of 10%. After doing some math and using the bleach calculator it seems like I'm better off sticking with the 6% at Walmart for $1.29 for 96 ozs. Other than convenience of not having so many bottles, is there any benefit to using the higher concentrated stuff?

    Does anyone have any resources for where to find liquid chlorine through somewhere else than a pool store. I've called feed stores, industrial cleaning supply stores and hardware stores.

    Thanks,
    Susie
    ~Susie
    27500 gal inground vinyl lined pool
    Pentair Clean & Clear Plus cartridge filter
    Pentair Whisper Flo 1HP pump

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    the pressure washing business uses a lot of 12% if you're near a town big enough to have a pressure washing supply store.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Dave,

    Thanks, haven't thought of that. There are places in town to rent them. It's worth a call.
    ~Susie
    ~Susie
    27500 gal inground vinyl lined pool
    Pentair Clean & Clear Plus cartridge filter
    Pentair Whisper Flo 1HP pump

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    The $3.14 per gallon for 10% chlorinating liquid is equivalent to $1.45 for 96 ounces of 6% bleach so not that much more than the $1.29 at Walmart. If your pool store will reuse the bottles by having you take the old ones back and you take a previously refilled one, then that saves on plastic recycling. That's why I do with my pool store and don't mind even if it's a little more expensive, but that's a personal choice.

    Other than carrying less weight, there's not much advantage to using the higher concentration chlorine.

    Richard
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    I saw this one too late, but it seems you discovered the truth. You won't find 20-22% anywhere near Houston. Bleach is highly regional. The highest made around here is 15% and it is only available sporadically and has a very short shelf life as others have stated.

    $3.00+ per gallon is very high but that's for a packaged product, so it costs a bit more than bulk.

    If you're willing to drive to Houston, PM me and I'll get you taken care of cheap.
    21' Leslies Beachland Ag Pool, 10,000 gallons, professionally installed (best money I ever spent) Hayward 16" sand filter w/Pentair two speed pump Fafco 4x20 solar heater,Aqua Trol RJ. Borates added. Hard plumbed.

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    IkeRay's Avatar
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    aquaman....you have something for us houstonians?

    and OP, if you want, my brother is always coming and going from SHSU to Houston to teach, I can always load up his jeep with some 12% pool store bleach if you want...
    30,000gal In-ground Gunite Pool DE filter
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    BBB method all the way - Newb, like to absorb info and chatter, but take the experts' advise

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