多介质过滤器是利用一种或几种过滤介质，在一定的压力下把浊度较高的水通过一定厚度的粒状或非粒材料，从而有效的除去悬浮杂质使水澄清的过程，常用的滤料有石英砂，无烟煤，锰砂等，主要用于水处理除浊，软化水，纯水的前级预处理等，出水浊度可达3度以下。

特点

1、多孔介质过滤器广泛用于水处理的工艺中，可以单独使用，但多数是做为水质深度处理(交换树脂、电渗析、反渗透)的预过滤。

2、多介质过滤器是常用的水质深度净化的预处理装置，可根据工艺要求填加不同的滤料。

3、多介质过滤器材质可采用玻璃钢、A3钢防腐或衬胶、全不锈钢。操作方式有全自动和手动两种形式，自动控制是采用美国进口的自动控制器及气、液动阀控制，操作简便易于维护保养，在各行各业水处理工艺的前处理装置得到广泛的应用。

4、多介质过滤器(含双滤料过滤器)的过滤材料应有足够的化学稳定性，各介质的相对密度和粒径应有一定差别，由无烟煤与石英砂组成的双层滤料过滤器所用的无烟煤相对密度为1.4-1.6，粒径为0.8-1.8mm，石英砂相对密度为2.6-2.65，粒径为0.5-1.2mm;3层滤料过滤器除了以上两种滤料外还可以用锰砂、磁铁矿之类的重质矿石，其相对密度为4.7-5.0，粒径为0.5-4mm。

The multi-medium filter is the process of using one or several filter media to clear water through granular or non-granular materials with a certain thickness under a certain pressure, thus effectively removing suspended impurities and making water clear The commonly used filter media are quartz sand, anthracite, manganese sand, etc. , mainly used for water treatment turbidity removal, softening water, pure water pre-treatment, water turbidity up to 3 degrees. Characteristics 1, porous media filter widely used in water treatment process, can be used alone, but mostly as water quality advanced treatment exchange resin, electrodialysis, reverse Osmosis pre-filtration. 2. multi-medium filter is a common pretreatment device for deep purification of water quality, which can be filled with different filter media according to process requirements. 3, multi-media filter material can be used FRP, A3 steel corrosion or lining plastic, all stainless steel. The automatic control is controlled by the automatic controller imported from the United States and the pneumatic and hydraulic valve, which is easy to operate and easy to maintain The pretreatment equipment of water treatment technology has been widely used in all walks of life. 4. The filter material with double filter media should have enough chemical stability, and the relative density and particle size of each medium should be different The relative density of anthracite in double-layer filter made up of anthracite and quartz sand is 1.4-1.6, the particle size is 0.8-1.8 mm, the relative density of quartz sand is 2.6-2.65, the particle size is 0.5-1.2 mm In addition to the above two kinds of filter media, the 3-layer filter media can also be used manganese sand, magnetite and other heavy ores, its relative density is 4.7-5.0, particle size is 0.5-4 mm.