About: http://webisa.webdatacommons.org/193092921

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 bed of media or pH adjuster material may be a layer with an aspect ratio as defined in the U.S. Pat. No. 6,383,395, a bed of two or more feet in depth, a column or other shape.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com