I searched the threads for information on sodium thiosulfate, but did not find an answer to the questions of whether sodium thiosulfate produces ammonia and whether this ammonia, if produced, dissipates on its own. I use the chemical after having shocked the pool for a few hours (shock to about 7 ppm when my combined chlorine is .5ppm). In other words does sodium thiosulfate produce more chloramines after shocking?
Sodium Thiosulfate Chemistry
- Thread starter Endless
- Start date
- May 3, 2014
- 58,475
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
There is no need for the use of sodium thiosulfate.
What CYA level do you have?
Let's ask @JoyfulNoise if he an answer your question.
What CYA level do you have?
Let's ask @JoyfulNoise if he an answer your question.
- May 23, 2015
- 24,440
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Thiosulfate contains no amine (nitrogen) groups so how can it form ammonia??
Sodium thiosulfate is simply a reducing agent. It reduces chlorine to to chloride and it becomes oxidized to form sulfate. So the products of the reaction are chloride and sulfate. There are various reactions between thiosulfate and chlorine and so the reaction is not pH neutral.
Sodium thiosulfate is simply a reducing agent. It reduces chlorine to to chloride and it becomes oxidized to form sulfate. So the products of the reaction are chloride and sulfate. There are various reactions between thiosulfate and chlorine and so the reaction is not pH neutral.
I have a2500 gallon endless pool . . . If I reduce the CL level to reduce effect on vinyl liner and rubber pool ligh5 gaskets, and to be able to use the pool sooner. CYA is 0.
- May 23, 2015
- 24,440
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
It’s not a pool. It’s a spa. My neighbor has one but you really can’t treat them like you do pools. They are just really big spas.
Anyway, is it open to sunlight at all?
And, FYI, if you used CYA it would have a buffering effect on the active chlorine levels such that you would not have to worry about the effect on your liner or o-rings. Chlorine without CYA is incredibly harsh. It’s a common misconception but CYA is not just for UV protection. It’s also a chlorine buffer.
Anyway, is it open to sunlight at all?
And, FYI, if you used CYA it would have a buffering effect on the active chlorine levels such that you would not have to worry about the effect on your liner or o-rings. Chlorine without CYA is incredibly harsh. It’s a common misconception but CYA is not just for UV protection. It’s also a chlorine buffer.
- May 23, 2015
- 24,440
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
That’s not a great setup. You need a supplemental oxidation source as all of the chlorine you put in the pool is going to create CCs. And, because you’re not using CYA, the chlorine/nitrogen reactions are going to favor the formation of the nastier nitrogen trichloride rather than monochloramine. You are also going to build up persistent combine chlorine compounds that chlorine itself cannot oxidize. So unless you are dumping your water regularly, it’s just going to build up.
I would highly suggest, if at all possible, that you add an external UV sanitizer to the swim spas plumbing. It’s not necessary for disinfection but will help to breakdown bather waste when your FC is low so that it doesn’t all form CCs. Do NOT use ozone as you are in a confined space and that would cause a respiratory hazard.
I would highly suggest, if at all possible, that you add an external UV sanitizer to the swim spas plumbing. It’s not necessary for disinfection but will help to breakdown bather waste when your FC is low so that it doesn’t all form CCs. Do NOT use ozone as you are in a confined space and that would cause a respiratory hazard.
- Jun 1, 2018
- 13,770
- Pool Size
- 26000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
We have a great guide u can follow
to care for your swim spa
www.troublefreepool.com
to care for your swim spa
How do I use Chlorine in my Spa (or pool)?
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