| 摘要 |
<p>A water filtration technique is designed to maximize the efficient performance of a variety of granular filtration media. The technique maintains the granular filtration media (62) in a compacted state between a perforated outer media container (56) and a perforated inner media container (58), where the perforated inner media container is a smaller similitude of the perforated outer media container. In the preferred embodiment of the filtration device of the present invention, the perforated outer and inner media containers are substantially spherical. By maintaining the granular filtration media in a static-state throughout filtration, highly efficient filtration is achieved. In contrast, during the backwash function, the normal inward flow is reversed to outward radial flow and granular filtration media is agitated, fluidized and quickly and vigoroulsy cleaned. A plurality of high-velocity centraly-located water jets (146) create the outward radial flow during backwashing.</p> |
