The common multi-media filters used in water treatment include anthracite quartz sand magnetite filter, activated carbon quartz sand magnetite filter, activated carbon quartz sand filter, quartz sand ceramic filter, etc.

多介質過濾器的濾層設計，主要考慮的因素為：

The main factors considered in the design of filter layer of multi-media filter are as follows:

1、不同濾料具有較大的密度差，保證反洗擾動後不會發生混層現象。

1. Different filter media have large density difference, which can ensure that mixing layer will not occur after backwashing disturbance.

2、根據產水用途選擇濾料。

2. Filter media should be selected according to the use of produced water.

3、粒徑要求下層濾料粒徑小於上層濾料粒徑，以保證下層濾料的有效性和充分利用。

3. The particle size of the lower filter material is required to be smaller than that of the upper filter material to ensure the effectiveness and full utilization of the lower filter material.

事實上，以三層濾床為例，上層濾料粒徑，有密度小的輕質濾料組成，如無煙煤、活性炭；中層濾料粒徑居中，密度居中，一般為石英砂組成；下層濾料由粒徑更小，密度的重質濾料組成，如磁鐵礦。由於密度差的限製，三層介質過濾器的濾料選擇基本上是固定的。上層濾料起粗濾作用，下層濾料起精濾作用，這樣就充分發揮了多介質濾床的作用，出水水質明顯好於單層濾料的濾床。而對於飲用水，一般禁止使用無煙煤，樹脂等濾料。

In fact, taking the three-layer filter bed as an example, the upper layer filter material has the largest particle size and is composed of light filter materials with small density, such as anthracite and activated carbon; the middle layer filter material has the middle particle size and density, and is generally composed of quartz sand; the lower layer filter material is composed of heavy filter materials with the smallest particle size and the largest density, such as magnetite. Due to the limitation of density difference, the selection of filter material for three-layer media filter is basically fixed. The upper filter material plays the role of coarse filtration, and the lower filter material plays the role of fine filtration. In this way, the function of multi-media filter bed is brought into full play, and the effluent quality is obviously better than that of single-layer filter bed. For drinking water, anthracite, resin and other filter media are generally prohibited.

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