The multi-media filter is a typical multi-media filter with layered anthracite, sand, fine garnet or other materials as the bed.

设备是压力式的，其原理是当原水自上而下通过滤料时，水中悬浮物由于吸附和机械阻流作用被滤层表面截留下来；当水流进滤层中间时，由于滤料层中的砂粒排列的更紧密，使水中微粒有更多的机会与砂粒碰撞，于是水中凝絮物、悬浮物和砂粒表面相互粘附，水中杂质截留在滤料层中，从而得到澄清的水质。经过滤后的出水悬浮物可在5毫克/升以下。

The equipment is pressure type, and its principle is that when the raw water passes through the filter material from top to bottom, the suspended solids in the water are intercepted by the surface of the filter layer due to adsorption and mechanical blocking; When the water flows into the middle of the filter layer, because the sand particles in the filter material layer are arranged more closely, the particles in the water have more opportunities to collide with the sand particles, so the flocs, suspended solids and sand surfaces in the water adhere to each other, and the impurities in the water are intercepted in the filter material layer, so as to obtain clear water quality. The suspended solids in the filtered effluent can be less than 5 mg / L.

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，但多数是作为水质深度处理的预过滤。

1. Porous media filters are widely used in water treatment processes and can be used alone, but most of them are used as pre filtration for advanced water quality treatment.

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。

2. Multi media filter is a common pretreatment device for deep purification of water quality. Different filter materials can be added according to the process requirements.

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。

3. The material of multi-media filter can be FRP, A3 steel anti-corrosion or rubber lining, all stainless steel. The operation modes are fully automatic and manual. The automatic control adopts the automatic controller and pneumatic and hydraulic valve control imported from the United States. It is easy to operate and easy to maintain. It is widely used in the pretreatment devices of water treatment processes in all walks of life.

4、多介质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。

4. The filter material of the multi-media filter shall have sufficient chemical stability, and the relative density and particle size of each medium shall be different. The relative density of anthracite used in the double-layer filter composed of anthracite and quartz sand is 1.4-1.6, the particle size is 0.8-1.8mm, the relative density of quartz sand is 2.6-2.65, and the particle size is 0.5-1.2mm; In addition to the above two filter materials, the three-layer filter can also use heavy ores such as manganese sand and magnetite, with a relative density of 4.7-5.0 and a particle size of 0.5-4mm.