A specialized water-filtration systems maker SSENG’s Gravity Flow Fiber (GFF) filter purifies water using gravity with a difference pf about 30-cm in the water level by making the fiber layer thinner. When backwashing, the filtrate of a nearby filtration basin is supplied as the backwash water naturally by the upward current of backwash blowing air. Therefore it requires neither a filtration pump nor a backwash pump, making GFF filter’s operational cost the lowest in the world. The filter’s rectangular plate shape also makes the size the most compact in the world geometrically and the Pore Controllable Fiber Filter ( PCF), which means system (lift type), flexible fiber bundles surrounding the strainer are pulled-up to the longitudinal direction to reduce its pore size, before the filtration is started. It is a precise and advanced fine fiber filter unit having backwash water with compressed air after releasing them. Accordingly, it is called an automatic backwashable cartridge filter.

The PCF system’sefficiency is over 90% in activate sludge treated water filtration, and suspended solids are below 1.5mg/s§ (average 0.8mg/s§ and below). With comparison of pressurizing sand filter, PCF is 1/5 in terms of volume, 1/10 in terms of weight (including filtering agent), and 2/3 in terms of price. The OASIS, DCOF drinking water purification process, using direct filtration after coagulation reduces its volume and installation area to 1/30 of that of
conventional precipitation/filtration methods.

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