<http://webisa.webdatacommons.org/33500778>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/162454007>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/33500778> .
<http://webisa.webdatacommons.org/prov/386927257>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/33500778> .
<http://webisa.webdatacommons.org/33500778>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<powerflushdoctor.co.uk> .
<http://webisa.webdatacommons.org/33500778>	<http://www.w3.org/ns/prov#value>	"High efficiency modern boilers have very narrow passageways in the heat exchanger and are very sensitive to rust, sludge, scale and other debris which can cause blockage." .