Quote Originally Posted by cleancloths View Post
I would suggest everyone avoid the high concentration stuff. You have no idea if it was left out in the sun and it degrades quickly. A few hours out in the sun and it may be down to 6% or less. I buy the 6% 96 oz bottle at Walmart here in NJ and they go for $1.17 a bottle.
No offense cc, but I think that's pure conjecture. It's definitely not been my experience. Using the PoolCalc I can always predict the rise in Cl in my pool when it's added which pretty clearly shows that it's concentration is as advertised. This includes using an unopened 5 gal. bottle that sat in my unheated garage all winter. Measured Free Cl before adding, calculated the amount to bring up x amount and then after one hour of circulating measured again and all's going according to plan.

Do you have evidence Cl will degrade in a sealed container? It's volatile and will evaporate in the open air, but actually degrade?

C.