Rapid sand filtration is a purely physical drinking water purification method. Rapid sand filters (RSF) provide rapid and efficient removal of relatively large suspended particles. Two types of RSF are typically used: rapid gravity and rapid pressure sand filters. For the provision of safe drinking water, RSFs require adequate pre-treatment (usually coagulation-flocculation) and post-treatment (usually disinfection with chlorine).
with great suddenness the car in front stopped abruptly, and we almost hit it Synonyms short, suddenlyRelated Words surprisingly, unexpectedly; directly, immediately, incontinently, instantaneously, instantly, promptly, pronto, right, right away, right off, straightaway; fast, full-tilt, posthaste, quick, quickly, rapidly, readily, snappily, ...
Example Sentences for abrupt. Her reflections were brought to an abrupt end by what President Morton was saying. The abrupt fall was not more than a foot now, and I had strong hopes that we could overcome it. The person who reads a monologue aloud will find that its abrupt transitions are a great help, and not a hindrance. He broke off, climaxing his question with an abrupt swing of the sword.