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, ...
Word forms: comparative hastier , superlative hastiest. 1. adjective [usually ADJECTIVE noun] A hasty movement, action, or statement is sudden, and often done in reaction to something that has just happened. One company is giving its employees airplane tickets in the event they need to make a hasty escape. Synonyms: speedy, fast, quick, prompt More Synonyms of hasty hastily (h eÉª stÉªli) adverb [ADVERB with verb]