About: http://webisa.webdatacommons.org/252010397

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	They also reduce nitrates, nitrites, sediment and unhealthy minerals such as lead and mercury.
http://www.w3.org/ns/prov#wasQuotedFrom	green-trust.org