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Thread: Trying new method _Dichlor-then-bleach method

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    Trying new method _Dichlor-then-bleach method

    Hello
    I Just changed my water, going to try the Dichlor-then-bleach method. I did the bromine method but family complaining of fumes.

    So I followed the start as described. 450 gallon Jacuzzi Hot Tub with ozonator.

    I balanced the water, then added 1 ounce of dichlor, so that means FC should be at 10 and cya is 9? I checked the FC the next day and got a zero reading?

    I am using a professional Taylor Test kit with powder and drops for the FC

    So I added another 1-ounce , took reading today and now FC is at 1 PPM. all other levels ok, so I added another one ounce.

    Will retest tomorrow.

    So I have added a total of 3 ounces of shock ( dichlor) so my CYA should be 3x9= 27 correct?

    Why is my FC not going up 10 ppm with every ounce I add ? does ozonator affect this? I am on the right track? any suggestions?

    Thanks
    22,000 IG vinyl liner
    sand filter
    LQ 8 gallon

    Jacuzzi Hot Tub
    420 gallons

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    frustratedpoolmom's Avatar
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    Re: Trying new method _Dichlor-then-bleach method

    I would switch to liquid now.
    I did a Google Search on the forum and found this article
    http://www.troublefreepool.com/an-oz...ll-t45134.html
    There may also be something lurking there consuming the FC (which would also explain the bad smell from before.)
    Helpful links: Pool School; CYA/Chlorine Chart
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    Re: Trying new method _Dichlor-then-bleach method

    Thanks, i will keep an eye on the FC level, dont know how to turn the ozonator level down?

    I hope I made a good choice

    I think the fumes were bromides and I had not changed my water in a while, I will start with the bleach now

    thanks
    22,000 IG vinyl liner
    sand filter
    LQ 8 gallon

    Jacuzzi Hot Tub
    420 gallons

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    linen's Avatar
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    Re: Trying new method _Dichlor-then-bleach method

    Was anyone using the spa as you have been adding the dichlor? If so, then much of your FC may have been going to oxidize bather waste. It takes about 7 ppm FC per person per hour (at 104F) to oxidize the waste.

    If no one has been using the spa, and if you continue to loose more than 25% of your FC per day, then a tub decontamination is in order. See the link to the decontaminaiton procedure in the Dichlor then Bleach post
    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.

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    Re: Trying new method _Dichlor-then-bleach method

    If you do not use the spa every day or two, then having an ozonator will make the daily chlorine loss with no bather load at least double if not more, so a 50% or greater loss per day. This is why having an ozonator makes sense when you use the spa frequently, but not if you don't. Dichlor-then-bleach might be a pain for you if your ozonator is powerful and you don't use the spa frequently. The ozonator may be on when the circulation pump is on so you might be able to lower your pump on-time to adjust the ozonator output.

    Ozone will also convert bromide to bromine so again if it's powerful and you created a large bromide bank (or built one up from using bromine tabs), then the ozone may be creating too much bromine and you found that to be too smelly.
    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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    Re: Trying new method _Dichlor-then-bleach method

    ****
    I do not want to go back to bromine, we maybe use it once a week. Any ideas for using chlorine or something else besides bromine? SO I guess it a good and bad thing to have an ozonator?

    Please any suggestions?



    Help
    22,000 IG vinyl liner
    sand filter
    LQ 8 gallon

    Jacuzzi Hot Tub
    420 gallons

  7. Back To Top    #7

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    Re: Trying new method _Dichlor-then-bleach method

    Well, another approach would be Nature2 with MPS where you just shock with chlorine every now and then, usually once every week or two. The ozonator shouldn't interfere with the MPS.

    Of course, you could see about disconnecting your ozonator or otherwise turning it down or making it switchable in some way.

    Another possibility would be more continuous chlorine dosing such as with the ControlOMatic TechniChlor. You would just need to make sure that your hot tub was able to handle the higher 2000 ppm salt level.
    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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  8. Back To Top    #8

    Re: Trying new method _Dichlor-then-bleach method

    Thanks chem geek,
    good plan, in fact Jacuzzi spas suggest nature 2 and MPS,

    My question is what MPS level should work the best to keep at ? , and then maybe I will shock every other weekend or when large bather load

    what should i shock at PPM? My cya is 30 since i added dichlor in beginning
    22,000 IG vinyl liner
    sand filter
    LQ 8 gallon

    Jacuzzi Hot Tub
    420 gallons

  9. Back To Top    #9

    Join Date
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    Re: Trying new method _Dichlor-then-bleach method

    If you use Nature2, just follow their instructions. The MPS level is generally measured by MPS test strips. I believe they target roughly 9 ppm oxidizer, but just go by the test strips which for MPS are reasonable. In terms of bather load, if there is no ozonator, then every person-hour of soaking in a hot (104F) spa requires around 7 teaspoons of MPS, but with your ozonator you might need to use half as much or perhaps even less.
    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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