About: http://webisa.webdatacommons.org/198896643

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	To provide moisture for an extended period, the apparatus is conveniently in the form of a bag, pipe or tube, allowing the water to be continuously or periodically flushed to prevent the built up of salts or other pollutants.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com