About: http://webisa.webdatacommons.org/214537086

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 materials most generally used as filter aids are diatomaceous silica, perlite, and other siliceous materials, carbon, and fibrous matter, such as asbestos and cellulose, and mixtures of these.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com