PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • However DIY on a tank that size should be pretty safe, particularly since your water sounds like it is got plenty of carbonate hardness.
http://www.w3.org/ns/prov#wasQuotedFrom
  • plantedtank.net