init：这个方法在容器实例化过滤器时被调用，它主要设计用于使过滤器为处理做准备。
Init : This method is called when the filter is instantiated by the container and is designed to prep the filter for processing.
为使过滤材料在使用中达到令人满意的性能，要求过滤介质具有适宜的孔径尺寸、孔径分布、孔体积、孔表面积及渗透性。
Filtration media is required to have suitable pore size, pore size distribution, pore volume, pore surface area and permeability for performing satisfactorily in applications.
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