About: http://webisa.webdatacommons.org/364578785

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	Some natural impurities are radon, fluoride, arsenic, Iron, lead, copper and other heavy metals.
http://www.w3.org/ns/prov#wasQuotedFrom	personalliberty.com