Possible Clues:

• Purified liquid
• Primarily liquid after it has been strained?
• Lift this at speed, having gone through the screen
• It'sa strain to flit at such a speed
• It's a strain to get this to flit at speed
• It's a strain to get it
• Flit at speed, having endured the strain
• Purified liquid turning sour? There's row about that
• Runny tar I left to seep through
• Remove the impurities by opening Tequila into a trifle mix