I just tested a jug of 8.25% bleach that has been at my house since we bought it (3 years )-anyone want to guess the free chlorine level?
Just for fun
- Thread starter JimMarshall
- Start date
0. No pink at all when I add the powder, still smells fine though! This is why checking dates is important!
Has it been reasonably determined how old 8.25% can be before it starts going downhill?
- May 3, 2014
- 58,551
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
- May 23, 2015
- 24,450
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
More like the bleach will DESTROY the reagent !!
+1 to what James says
Even if the bleach were down to 0.5% strength, that would still be 5000ppm. The pH of bleach is also very high, typically above 12. So the combination of high pH and high chlorine levels will destroy any organic compound added to it.
Bleach tests either require large serial dilutions (1mL in 1L of water then diluted again) OR a specialized test kit for bleach that uses a starch-iodine indicator with thiosulfate reduction.
So you guys don't believe that after 3 years it would degrade to the point of being straight saltwater?
- May 3, 2014
- 58,551
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
Doubtful. Make a solution that would be 30 ppm FC if full strength. Use distilled water and the bleach. Then use our FAS-DPD to test it.
- May 3, 2014
- 58,551
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
You could. Normal municipal water would have some chlorine in it, but your well water would not unless you add it.
We do not. I was assuming that the chlorine was the reason for suggesting distilled but wanted to confirm.
- May 23, 2015
- 24,450
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
It's not that we don't believe it, it's that the chemistry is all wrong.
The DPD test only works when the FC is below a certain level (<50 ppm for the R-0870 powder) and when the pH is in range (slightly acidic but buffered using phosphate buffers). The concentration of hydroxide (OH-) in bleach is orders of magnitude higher than pool water (pH is logarithmic in scale) and so the phosphate buffers will simply not work. Therefore, the entire basis of the test is invalid. Even if you got a pink color, I would not consider the results reliable.
You must dilute the bleach if you want to use the DPD test.
Wow great posts
I have always thought the 'çheck the date code' mantra a bit OTT
As long as the bleach isnt stored out in the sun or heat it lasts for ages especially if it is lower strength
Going by the odyssey chart 5% bleach has a half life of over three years at 75 degrees F
I have always thought the 'çheck the date code' mantra a bit OTT
As long as the bleach isnt stored out in the sun or heat it lasts for ages especially if it is lower strength
Going by the odyssey chart 5% bleach has a half life of over three years at 75 degrees F
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