Bleach/Liquid Chlorine starts decomposing after it is manufactured. Check this link to see the half-life table (half-life means half of the original strength). Note that decomposition occurs faster for higher strength chlorine and faster at higher storage temperatures.
Bleach/Liquid Chlorine Date Code Decoder
Here is a Julian Date chart.
- Home Depot HDX Chlorine Date Decoder - 18 100 = year 18 and 100 days in so April 10th 2018.
- Clorox - A5 13 183 TX-1 08:41 (Day 183 of 2013) = year 2013 day 183[1]
- Walmart Great Value - 14 183 11:03 B1 = year 2014 day 183
- Walmart White Cloud - 14 144 12L59 B2 TX-01 = year 2014 day 144
- Smart(Home Depot) - 34713FL07:30 = year 2013 day 347
- HTH Liquid Chlorinator - 14JA0366B 11:15 = year 2014 day 366
- Kem-Tek - 1416210:25C = year 2014 day 162
- Dollar General - 14 169 02:59 B2 TX-01 = year 2014 day 169
- Online Packaging Inc - BB 07/01/15 (Date of Manufacture is 1 year prior to the "Best By:" date.) In this case Manufactured date is 07/01/2014.
- Blue Whale Shock Chlorinator - xxYYDDDhhmm
- HASA Classic Bleach - E1257 = 125th day of 2017[2]
