PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Common sources of Nitrate contamination include bird droppings, lightning, fertilizer from nearby yards, and also by leaves and other plants falling into the water. (These are not the only sources, but they are the most common ones.) AquaChek Nitrate/ Nitrite test strips makes it easy to monitor and control the levels of Nitrite and Nitrate in pool water. 25 Nitrate test strips per bottle.
http://www.w3.org/ns/prov#wasQuotedFrom
  • poolcenter.com