Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: Bromine spa regular oxidizer amounts

  1. Back To Top    #1

    Join Date
    Apr 2016
    Location
    College Station, TX
    Posts
    79

    Bromine spa regular oxidizer amounts

    From the sticky, @chem geek said:
    Code:
    How do I use Bromine in my spa (or pool)?
    
    You could just add some bleach or MPS, up to you (bleach is less expensive, of course).  Each fluid ounce of 6% bleach in 350 gallons would increase the bromine level by around 3 ppm.
    Can I calculate my oxidizer amount linearly based on this? For example, I have 10% bleach and a 220 gallon tub, so if I say .06 "oz units" of chlorine per 350 gallons is equivalent to .0377 "oz units" in a 220 gallon tub, then .377 oz of 10% should raise my tub 3 ppm of bromine from my bromide bank. Is that true? And if I divide by 3, then approximately 1/8 oz of my 10% in my 220 gallon tub converts bromide to bromine at 1 ppm?

    Also, with OTO, after adding bleach, will my reading be total bromine + chlorine until the conversion is complete? About how long does the conversion take (minutes, days?)?

    Does the chlorine FAS-DPD (R-0871) test show me only chlorine?

    The addition of borates made an instant improvement. I highly recommend it. The water is "sparkly" and feels better. And getting the TA just right so that the pH stays constant has made everything so much easier. Thanks for the guidance TFP!
    Intex 16'x32'x54" 17Kgal AGP since 2014. Sand filter, Hayward skimmer, home built 10'x15' deck and stairs, solar heater. High TA tap water, moderate rainfall, weekly use. Treated with 10% bleach, MA and some dichlor initially. Soon to add borates.
    Taylor K2006C
    Future projects - automatic chlorine pump, online pool sensors, better heater, IGP (maybe)

  2. Back To Top    #2

    In the Industry

    Donldson's Avatar
    Join Date
    Jun 2009
    Location
    NW Ohio
    Posts
    2,637

    Re: Bromine spa regular oxidizer amounts

    I believe your calculations are correct, but you can use PoolMath to figure it out. Just plug in your numbers for 10% LC and for every 1 ppm FC it will add 2.5 ppm Br.

    The OTO will show the total of both but the conversion is quite fast. I would call it minutes at most.

    The FAS-DPD will show total bromine I believe, which is what you want. Someone will correct me if that is not entirely true. I personally just use OTO when I check a spa.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
    Pool School - PoolMath - HIGHLY Recommended Test Kits

  3. Back To Top    #3
    bbrock's Avatar
    Join Date
    Apr 2014
    Location
    Livermore, CA
    Posts
    535

    Re: Bromine spa regular oxidizer amounts

    To use FAS-DPD for bromine multiply the end result by 2.25.

    Before my recent drain/fill, when I shocked my bromine spa w/ 12.5% chlorine, it would increase/shoot up my bromine level for multiple days. Again, on my prior old water, I would shock 1x/week w/ 75 ml 12.5% chlorine and this was for a 300 gal. spa. If I recall correctly, I think my bromine level was >10 for at least 2-3 days. But, this was without usage of the spa. Not sure if any of this helps you.
    19k gal IG plaster, built '70s, probably resurfaced in '80s-'90s; Blue Haven Hayward filter C4520BHMB (Filbur FC-1275 cartridges); Hayward MaxFlo sp2302 VSP 1.5hp; 6 solar panels 288. sq. ft. total (142"x47.5" ea.) on 1 story hm; Pentair Compool LX220 Solar Controller; FlowVis flow meter; Maytronics Dolphin S200; AG 300 gal AquaTerra spa; TF-100 & Speedstir; gone: Pentair Challenger 3/4 HP 1 speed; Polaris 280

  4. Back To Top    #4

    Join Date
    Apr 2016
    Location
    College Station, TX
    Posts
    79

    Re: Bromine spa regular oxidizer amounts

    Quote Originally Posted by bbrock View Post
    Before my recent drain/fill, when I shocked my bromine spa w/ 12.5% chlorine, it would increase/shoot up my bromine level for multiple days.
    Thanks bbrock. That's what I was expecting. But it would drop right away. I think my 'free, used' hot tub had some goo in the tubes. It's holding now but on the next drain it's getting ahhhhh-some.

    On that note, a free hot tub is worse than a free puppy. Seriously would have been better off purchasing this thing new.
    Intex 16'x32'x54" 17Kgal AGP since 2014. Sand filter, Hayward skimmer, home built 10'x15' deck and stairs, solar heater. High TA tap water, moderate rainfall, weekly use. Treated with 10% bleach, MA and some dichlor initially. Soon to add borates.
    Taylor K2006C
    Future projects - automatic chlorine pump, online pool sensors, better heater, IGP (maybe)

  5. Back To Top    #5
    bbrock's Avatar
    Join Date
    Apr 2014
    Location
    Livermore, CA
    Posts
    535

    Re: Bromine spa regular oxidizer amounts

    Free... yeah I would be a little concerned about what's lurking in that plumbing. I just used Ahh-Some on this current drain/fill. That stuff got things out I don't even know were in there... such as that missing sock I haven't been able to find.
    19k gal IG plaster, built '70s, probably resurfaced in '80s-'90s; Blue Haven Hayward filter C4520BHMB (Filbur FC-1275 cartridges); Hayward MaxFlo sp2302 VSP 1.5hp; 6 solar panels 288. sq. ft. total (142"x47.5" ea.) on 1 story hm; Pentair Compool LX220 Solar Controller; FlowVis flow meter; Maytronics Dolphin S200; AG 300 gal AquaTerra spa; TF-100 & Speedstir; gone: Pentair Challenger 3/4 HP 1 speed; Polaris 280

Posting Permissions

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