About: http://webisa.webdatacommons.org/451311455

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	In addition, the concentration of undersirable metals can be reduced when water is passed through a canister housing metallic particulate material comprising copper and zinc, such as brass.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com