Multi media filter is also known as mechanical filter (now some people call quartz sand filter as multi-media filter, because quartz sand particle size is different, divided into 2-3 specifications), mechanical filter, alias many, is actually the same filter, in water treatment process, is the most commonly used mechanical filtering equipment, because the filter material is cheap, environmental protection, filtering effect So quartz sand filter has been fully used in water treatment.

多介質(zhì)過濾器為什么要進(jìn)行反洗呢？我們從多介質(zhì)過濾器的作用說起，多介質(zhì)過濾器主要是過濾與攔截水中的懸浮物，泥沙，有機(jī)物等雜質(zhì)。過濾原理主要是通過石英砂截留來的，所以多介質(zhì)過濾器工作一段時間后，砂的縫隙間有許多的細(xì)小顆粒物，如泥，有機(jī)物等雜質(zhì)等。如果不對其進(jìn)行反洗，過濾罐體內(nèi)攔截的泥沙等雜質(zhì)會越積越多，從而影響了源水的通過性，并使出水壓力變小，過濾流量減少，不但浪費(fèi)了寶貴的能源（電能，水泵提供動力），而且出水水質(zhì)不達(dá)標(biāo)，所以，多介質(zhì)過濾器使用一段時間后必須要進(jìn)行反洗工作。

Why should the multi-media filter be backwashed? First of all, we start from the role of multi-media filter, multi-media filter is mainly to filter and intercept suspended solids, sediment, organic matter and other impurities in the water. The filtration principle is mainly intercepted by quartz sand, so after the multi-media filter works for a period of time, there are many fine particles between the sand gaps, such as mud, organic matters and other impurities. If it is not backwashed, the sediment and other impurities intercepted in the filter tank will accumulate more and more, which will affect the trafficability of the source water, reduce the outlet pressure, and reduce the filtration flow, which not only wastes valuable energy (electric energy and pump power), but also the effluent quality is not up to standard. Therefore, the multi-media filter must be backwashed after a period of time.

多介質(zhì)過濾器有兩種反洗方式，一種是氣水反洗，另外一種是水反洗。

There are two backwashing methods for multi-media filter, one is air-water backwashing, the other is water backwashing.

氣水反洗：是利用空氣的氣泡還有石英砂濾料兩者相互摩擦，再者就是利用石英砂濾料的顆粒與顆粒之間的摩擦力，也就是利用石英砂濾料和水相沖的摩擦力，四者相互作用，在的限度上增加了反沖洗的效果，這樣經(jīng)過反水洗后的石英砂濾料就可以進(jìn)行正常使用。優(yōu)點是：反洗時間較短，耗水量少。所以工泉水處理科技有限公司反洗方法是：汽水反洗

Air water backwashing: the air bubble and quartz sand filter material are used to rub each other, and the friction force between the particles of quartz sand filter material is used, that is, the friction force of quartz sand filter material and water is used. The interaction of the four factors increases the backwashing effect to the maximum extent, so that the quartz sand filter material after backwashing can be operated normally Use. The advantages are: shorter backwashing time and less water consumption. Therefore, Gongquan Water Treatment Technology Co., Ltd. recommended backwashing method is: steam water backwashing