Using centrifugal force to whirl the untreated water above the filter media (sand) helps to remove suspended solids to accumulate on the inside walls of the tank. as a result, much finer sand can be used without clogging problems. The water, now largely free of impurities, is filtered through the media and subsequently collected and used for a variety of purposes. Contaminants trapped above the sand are removed using an automatic backwash cycle, which requires less water and a shorter operating time than conventional sand filter systems. This process contributes to longer cycles and much finer filtration levels (0.45-micron as compared to 10-micron or more).

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