Assertion: antifreeze | /r/ObjectUse | used in older systems
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Source sentences:
text: Antifreeze can be used in older systems installed prior to Sept. 30, 2012, but it adds complexity to a system, carries risk if the solution is not mixed right or settles improperly in the pipes, and annually testing it and measuring samples requires the help of a professional – unless you happen to have a “hydrometer with a scale having 0.002 subdivisions” sitting around, plus the expertise to make the appropriate calculations.