If 12.5% bleach from the pool store is still in the sealed box that 4 one gallon jugs come in and has been in the store, in AC, no sunlight and the manufacture date code on the box is 5/13/14 is it still 12.5% or has it dropped? If it has dropped at what % has it dropped to?
Question about age of bleach
- Thread starter Erack
- Start date
I'd bet it's not 12.5% anymore. Could be wrong though. The higher the chlorine percentage the faster it degrades. I've gotten 12,5% at our Ollie's that was 3-4 months old and it didn't raise the FC level that pool math said it should. It worked out to be 10%.
Try some and see what results you get. ?
Try some and see what results you get. ?
Yes I have bought two cases so I have to use it. I have been waiting 30 mins after additions to retest. It is looking like it is 9%. Should have bought 8.75% from Walmart 
It is for certain that this one jug is 9%. Would it be safe to assume the other jugs in the case are 9% as well or should I treat them as a higher % and test before using amounts based on a 9% result?
It's likely that they are all the same assuming they were manufactured at the same time and stored in the same conditions. You can just see the result from using them since if you are wrong you won't be overshooting by very much (they certainly won't still be at the original 12.5% in any event).
- May 22, 2013
- 2,796
- Pool Size
- 12000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
Yes I have bought two cases so I have to use it. I have been waiting 30 mins after additions to retest. It is looking like it is 9%. Should have bought 8.75% from Walmart
BUT , , , why wouldn't you have the same question about Walmart's ?? Depending on the date on it and the conditions where it was stored and whether it was in a hot trailer being transported across country is it still 8.75 or 7.5, 7 or less
I always forget about this factor when people are saying how much bleach they are adding and not ever reaching their target....