How much liquid chlorine will it take to convert 4 lb of sodium bromide powder?

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BlindinOC

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Dec 15, 2016
18
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After several bouts with mustard algae and trying the slam process twice I resorted to adding sodium bromide to my pool as the final solution

I added 4 pounds to a 13000 gallon pool the pool is outside and gets a lot of direct sun so the bromine levels don't stay high during the daytime I have been shocking it with liquid chlorine at dusk every day so far I have added 2 gallons of liquid chlorine 12.5%

What I am hoping to figure out is how much liquid chlorine I will need to add to the pool in order to have converted all of the sodium bromide into bromine hence returning it to a chlorine pool here are my measurements from my most recent trip to the pool store yes I can feel your judgement LOL

Pool size 13000 gallons outdoor with Spa in corner

Free chlorine bromine was 1.5

CC was Zero

Cya level 30

Total alkalinity 130

PH 7.5

Phosphates 300

TDS 1500
 
You now have a bromine pool. All the chlorine you add now will reactivate your bromine, but I'm pretty sure the only way to get it back to a chlorine pool is a drain/refiill or a LOT of time. And I doubt anyone can predict how long a time that would take.

How did you manage to "slam twice" yet you don't have a good test kit of your own? :scratch:

Maddie :flower:
 
There has to be some finite amount of chlorine that this finite amount of bromide will react with looking for an equation

I will not be adding any additional sodium bromide to the cool and it will eventually exhaust the sodium bromide that is in the water from what I have read the bromine is destroyed by UV rather quickly and as I continue to add chlorine it will continue to convert the sodium bromine until eventually there is no sodium bromine left just curious if someone has an equation to show how much chlorine 4 pounds of sodium bromine will react with
 
BlindinOC said:
There has to be some finite amount of chlorine that this finite amount of bromide will react with looking for an equation

I will not be adding any additional sodium bromide to the cool and it will eventually exhaust the sodium bromide that is in the water from what I have read the bromine is destroyed by UV rather quickly and as I continue to add chlorine it will continue to convert the sodium bromine until eventually there is no sodium bromine left just curious if someone has an equation to show how much chlorine 4 pounds of sodium bromine will react with
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It doesn't work like that. Chlorine oxidizes the bromide to bromine. As bromine breaks down, it reverts back to bromide.

You have no net loss of bromide.

You're going to have a bromine pool for a while unless you drain and refill, which might be a huge risk to your pool.
 
Jock Hamilton, president of United Chemical sells a line of pool specialty chemicals that are based on sodium bromide. He claims that bromide in pool water breaks down rapidly, rather than slowly. Apparently, he's right . . . at least for outdoor pools exposed to sunlight.

Let me state it this way: in pools exposed to sunlight, bromine persistence is usually a long-term problem ONLY if the pool is brominated with any form of bromine tabs!

http://www.poolsolutions.com/tips/once-a-bromine-pool-always-a-bromine-pool.html
 
I don't know of any scientific data that describes what happens to bromide over time under various circumstances.

Maybe it will go away over time, but at what rate?

If you have any scientific references that show by experiment what happens to bromide over time, please post them.

While the article is interesting, I don't consider it to be sufficient.

The main person claiming that the bromide goes away sells bromide products, and therefore has a conflict of interest.
 
I hear a lot of Witchcraft on both sides of the conversation and I was hoping to find some factual information regarding how sodium bromide degrades in an outdoor environment

The writer of the article agrees with the pool chemical guy but there isn't much else out there
 

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There's no witchcraft being proposed by anyone.

The basis for the persistence of bromide is basic chemistry.

If there's a mechanism for the loss of bromide over time, then it should come from a qualified source.

Also, to answer your initial question, it takes 337 ounces of 12.5% trade sodium hypochlorite to oxidize 4 lbs of sodium bromide.
 
Adding 337 oz 12.5% liquid chlorine to 13,000 gallons of pool water will raise fc by 25.

If the water contains 4 lbs sodium bromide, then the chlorine will oxidize the bromide to bromine resulting in a bromine level of 56 ppm.

As the bromine gets used up, it reverts back to bromide. So, no loss of bromide.

There's probably some bromine/bromide lost over time to factors other than water loss (excluding evaporation) and refill (dilution).

However, I don't know anything specific about how or how fast bromine/bromide might dissipate over time.

4 lbs sodium bromide in 13,000 gallons will be 36.8 ppm sodium bromide. 28.58 ppm will be bromide. 28.58 ppm bromide becomes 57.16 ppm bromine (by convention, bromine is measured as Br2).

If more than 25 ppm of chlorine is added, you still get 57 ppm bromine with the additional chlorine remaining as chlorine.
 
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