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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