About: http://webisa.webdatacommons.org/320430870

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	Various plastic materials and mats, or natural materials such as lava rocks, sand, gravel and plants (not supplied) may be utilized as filter media.
http://www.w3.org/ns/prov#wasQuotedFrom	123ponds.com