About: http://webisa.webdatacommons.org/39839716

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	Because of the energy required to backwash and the loss of water occurring during each backwashing operation, there is a practical limit in the prior art on how often a biofilter may be backwashed.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com