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,
First, the outflow flow is small.
Second, the quality of effluent is poor.
Third, the packing will agglomerate, and it will not be cleaned after a long time.
In case of the third situation, the filter material must be replaced.
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.