About: http://webisa.webdatacommons.org/413310718

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	Effective water purification to a level that meets pharmaceutical-grade water (PGW) quality standards typically requires extensive mechanical, filtration, chemical, and other forms of manipulation.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com