The shelf life of chlorination compounds varies significantly depending on the type of compound and storage conditions.

 The shelf life of chlorination compounds varies significantly depending on the type of compound and storage conditions. Granular chlorine, when properly stored, can last for up to 5 years. Solutions like neutralized sodium hypochlorite (NaOCl) have a much shorter shelf life, with neutralized solutions lasting only a few hours. Other options, such as sodium dichloroisocyanurate (NaDCC) and calcium hypochlorite, have a longer shelf life, with NaDCC lasting 2 days and calcium hypochlorite up to 24 months when properly stored. 

Here's a more detailed breakdown:

Granular Chlorine: Can last 3-5 years with proper storage (cool, dry, sealed container). 

Sodium Hypochlorite (NaOCl) Solutions: Neutralized solutions (pH 7) have a shelf life of a few hours, while stabilized or generated solutions can last longer, potentially over 30 days. 

Sodium Dichloroisocyanurate (NaDCC): Lasts for 2 days when used for disinfecting. 

Calcium Hypochlorite: Can last up to 24 months when properly stored. 

Liquid Chlorine Gas: Can last 6-12 months when stored properly. 

Bleach (Sodium Hypochlorite): Starts degrading after 6 months and can last up to a year when properly stored.