Combining chlorine and bromine/ shocking a spa

Sjde

Well-known member
Apr 29, 2016
181
Denver CO
I have read you can’t combine chlorine and bromine in a spa , yet when reading directions for shocking a bromine spa, many say you can use either non chlorine shock ( MPS) or chlorine shock ( Dichlor). Can someone please explain?
 

Oly

Gold Supporter
Jun 28, 2017
881
Fresno, CA
Check this out......https://www.troublefreepool.com/threads/how-do-i-use-bromine-in-my-spa-or-pool.84/
 

Sjde

Well-known member
Apr 29, 2016
181
Denver CO
Yes, I have read that and when it says-

“There is no advantage to using dichlor (stabilized chlorine) for shocking a bromine system but it probably wouldn't hurt.”

that’s when I wonder why, because isnt that mixing bromine and chlorine , which in other places I have read you should never do.
 

Donldson

TFP Expert
LifeTime Supporter
In The Industry
Jun 12, 2009
3,611
NW Ohio
Wherever you read that you should probably reconsider taking advice from that source. When you add chlorine to a body of water with sodium bromide in it the chlorine just activates the bromide in to bromine. In fact many bromine tablets have dichlor in them.
 

Sjde

Well-known member
Apr 29, 2016
181
Denver CO
Wherever you read that you should probably reconsider taking advice from that source. When you add chlorine to a body of water with sodium bromide in it the chlorine just activates the bromide in to bromine. In fact many bromine tablets have dichlor in them.
It was our hot tub manufacturer who said that.

And Swimuniversity-Whether you choose chlorine or bromine, DO NOT: mix them together in the water.
 

Donldson

TFP Expert
LifeTime Supporter
In The Industry
Jun 12, 2009
3,611
NW Ohio
Oh no, not a DANGEROUS CHEMICAL REACTION!!!! Why, if you do that you might get... more bromine! :laughblue:

Like I said, reconsider your sources. Those comments are demonstrably false. Chlorine and bromine regularly co-exist in a spa or pool because people don't have a large enough bromide bank. People regularly add sodium bromide to their chlorine pools to fight algae (something we DO NOT recommend) and that creates a bromine/chlorine situation. This is nothing unusual or new.

I do believe this isn't the first time we have had to correct some awful information from Swim Uni.
 

Sjde

Well-known member
Apr 29, 2016
181
Denver CO
And here's another example of conflicting information. As far as what the calcium hardness reading should be: SwimUniversity 175 to 275, poolcareguy-80 to 200, one CS person at our spa mfr-75 to 150 (for our acrylic spa), and another one there- 175 to 225. A test strip container--250 to 450. Frustrating!
 
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