Assertion: ozone | /r/HasProperty | cost-effective method
Facets:
value: due to the minimal maintenance
type: CAUSE
value: in the long run
type: TEMPORAL
Source sentences:
text: Where electrical power is abundant, ozone is a cost-effective method of treating water, since it is produced on demand and does not require transportation and storage of hazardous chemicals.
text: In the long run, however, ozone might be the more cost-effective choice due to the minimal maintenance associated with some ozone systems.