About: http://webisa.webdatacommons.org/409587639

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	The backwash step can last for any suitable amount of time, such as 10-12 minutes.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com