CWP is a ceramic water purifier. It is made made with a mix of local terra-cotta clay and sawdust or other combustible, such as rice husks. After the object has been fired it is coated in colloidal silver. This filters through 99.88% of most water born disease agents.
Silver has been used in the past for food preservation if used carefully.
http://s189535770.onlinehome.us/pottersforpeace/wp-content/uploads/brief-history-of-colloidal-silver.pdf
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