水处理里面很多过滤器需要进行反冲洗的，特别是填料过滤器，通过填料拦截将杂质过滤到填料中，如果不及时进行冲洗，会出现一下情况，
Many filters in the water treatment need to be backwashed, especially the packing filter. Impurities are filtered into the packing through the packing interception. If the filter is not washed in time, there will be a situation,
、出水流量小。
First, the outflow flow is small.
第二、出水水质差。
Second, the quality of effluent is poor.
第三、填料会结块，时间长了都冲洗不干净。
Third, the packing will agglomerate, and it will not be cleaned after a long time.
当出现第三种情况，必须要进行更换滤料。
In case of the third situation, the filter material must be replaced.
下面是因为长时间不清洗的石英砂过滤器，石英砂滤料出现情况。严重出现了结块的现象。
The following is because the quartz sand filter is not cleaned for a long time, and the quartz sand filter material appears. The phenomenon of caking appeared seriously.
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