多介质过滤常用于水处理的情况，详细作用是为水源除浊、反渗透以及离子交换软化除盐系统的前级预处理，也可用于地表水、地下水除泥沙。
Multi media filtration is often used in water treatment. Its detailed function is to remove turbidity from water source, reverse osmosis and ion exchange to soften the pre-treatment of desalination system. It can also be used to remove sediment from surface water and groundwater.
多介质过滤器滤料选择：
Selection of filter media for multi media filter:
(1)必须有足够的机械强度，以免在反冲洗过程中很快地磨损和破碎；
(1) It must have enough mechanical strength to avoid quick wear and breakage during backwashing;
(2)化学稳定性要好；
(2) The chemical stability is good;
(3)不含有对人体健康有害及有毒物质，不含有对生产有害、影响生产的物质；
(3) It does not contain substances harmful to human health and toxic substances, and does not contain substances harmful to production and affecting production;
(4)滤料的选择，应尽量采用吸附能力、截污能力大、产水量高、出水水质好的滤料。
(4) The selection of filter materials should try to use the filter materials with high adsorption capacity, high sewage interception capacity, high water yield and good effluent quality.
在滤料中，卵石主要是起支撑作用，在过滤工艺过程中，因其强度高，相互之间的间距缝隙稳定，孔隙大，便于正洗工序中，滤后水顺利通过；同样，反洗工序中，反洗水和反洗空气等能顺利通过。
In the filter media, pebbles mainly play a supporting role. In the process of filtration, due to their high strength, stable gap and large pores, it is convenient for the filtered water to pass smoothly in the washing process; Similarly, in the backwashing process, the backwashing water and air can pass smoothly.
常规配置中，卵石分为四种规格，铺垫方式为自下而上先大后小。
In the conventional configuration, the pebbles are divided into four specifications, and the paving method is from bottom to top, large first and small later.
滤料的粒径和装填高度之间的关系
The relationship between the particle size of the filter material and the filling height
滤床的高度和滤料的平均粒径的比值为800～1 000(设计规范)。
The ratio of the height of the filter bed to the average particle size of the filter media is 800-1000 (design specification).
滤料的粒径的大小和过滤精度相关。
The particle size of filter media is related to the filtration accuracy.
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