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We contacted P&G asking for the manufacturer's recommendations yesterday morning, but have still to hear back. Do P&G have a presence on the ground? Perhaps they would be able to evaluate the stock and determine whether their expiry date could be extended, or they could be otherwise recycled.

My understanding is that the active ingredients are ferrous sulphate and calcium hypochlorite*. So certainly don't burn them, they would release sulphur dioxide (toxic) and calcium hypochlorite is a class III oxidant (will cause a severe increase in the burning rate of combustible materials with which it comes into contact).

I understand that the US EPA would classify Calcium Hypochlorite as a D001 Hazardous Waste (Ignitable). I will try to get a waste disposal expert to post their thoughts on what the implications for this are likely to be in South Sudan.

*https://www.cdc.gov/safewater/publications_pages/pubs_pur.htm