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, ...
To make a sudden loud, explosive noise. 2. To crash noisily against or into something: My elbow banged against the door. adv. 1. Exactly; precisely: The arrow hit bang on the target. 2. Suddenly; abruptly: cut the conversation bang off. interj. Used to indicate the sound of an explosion or collision.bang away. 1. To speak or ask questions in a rapid, aggressive manner: reporters banging away at the official during the press conference. 2.sed to indicate the sound of an explosion or collision. bang away. 1. To speak or ask questions in a rapid, aggressive manner: reporters banging away at the official during the press conference.