How quickly does chlorine degrade after manufacturing date?


Well-known member
Apr 23, 2018
A local store has 10% liquid chlorine on sale for $8.99 for 4 gallons, which is cheapest price I could find in my town. Manufacturing date was April 2nd, and it has probably been stored inside the store the whole time since I remember seeing it there in April. I plan on using it within 2 weeks of purchasing and will store it inside. I couldn't find anything on this site that talks about how quickly liquid chlorine degrades so I wasn't sure if I should buy this or pay more for some fresher chlorine.


Platinum Supporter
TFP Guide
Jul 30, 2014
Monmouth County, New Jersey
The schedule that I attached I believe only shows 12.5% and 8.25%. One thing to keep in mind is that the lower the % concentrations, the slower is breaks down. Higher concentrations like 12.5% will break down even faster.

It appears that even after a few months at 10%, the price is very fair.