any of various powders used to increase the porosity of a filter cake and prevent it from blocking the filter.
| 单词 | θ61372 | 
| 释义 | the world > physical sensation > cleanness and dirtiness > freedom from impurities > removal of impurities > filtering or percolating > 			[noun]		 > filter aid (1)		 filter aid1914 any of various powders used to increase the porosity of a filter cake and prevent it from blocking the filter. | 
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