Assertion: phosphate | /r/HasProperty | introduced into the boiler system
Facets:
value: not necessarily
type: DEGREE
value: preferably,
type: DEGREE
Source sentences:
text: For purposes of the present invention the same inert tracer or a another tracer is introduced into the boiler system in a known and uniform proportion to the phosphate, and preferably, but not necessarily, it is introduced into the boiler system as a component of the phosphate feed to the boiler or boiler feedwater in a known and constant concentration proportion with respect to the phosphate.