About: http://webisa.webdatacommons.org/248503536

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	Other types of adsorption filters can be included for specific removal of particular contaminants such as arsenic, iron, calcium, and other ions but these generally require a backwash for regeneration.
http://www.w3.org/ns/prov#wasQuotedFrom	waterpurifier.org