Assertion: hydrogen fluoride's amount | /r/HasProperty | treated
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Source sentences:
text: On the contrary, if the fluorine concentration is less than 0.5% by weight, an amount of solution to be treated becomes so large that an apparatus used therefore must be designed uselessly large, and an amount of fluorine lost from the system together with the mother liquor becomes so large that the recovery rate of CaF 2 becomes unfavorably lowered.