| 摘要 |
An improved liquid filtration system is provided which comprises, in combination, a tank or other vessel having a central cavity and a liquid inlet tube and liquid outlet tube spaced apart. A porous self-supporting filter is arched over the liquid outlet tube and forms part of the system. The filter comprises granules cemented together by organic resin. For example, fine aggregate stone particles are cemented together by an epoxy resin so that the filter is both porous and strong. Preferably, the upstream portion of the filter contains a first layer of fine aggregate while the downstream portion of the filter contains a layer of larger aggregate. The system also includes a connector releasably securing the filter over the outlet tube. The filter is relatively small, occupies only a small portion of the bottom of the tank, can be removed for cleaning and replacement and is light in weight. Preferably, the filter has an upstream cover portion of a porous metal plate material in domed configuration. The filter is inexpensive, durable and efficient. A mass of loose particles of filtering medium is disposed in the tank above the rigid filter and the tank is supported on depending legs.
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