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Flush

1. To open a cold-water tap to clear out all the water which may have been sitting for a long time in the pipes. In new homes, to flush a system means to send large volumes of water gushing through the unused pipes to remove loose particles of solder and flux. 2. To force a cleansing liquid rapidly through piping, tubing, storage vessels, process tanks, or other plumbing items to clean them out.