Antonyms of FILTER

Examples of usage:

  1. In spite of all precautions, however, some solid usually separates on the filter. "Organic-Syntheses" by Conant, James Bryant
  2. I heard somebody say that by the time the smoke got through all the filter, you'd lost the habit. "Combat" by Dallas McCord Reynolds
  3. I remembered bitterly that, when I left them at Strasburg, I had begged them never to fill up without a filter. "The Brother of Daphne" by Dornford Yates
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