The reason for the compression of quartz sand stone washing agent is:

The colloidal substances accumulated on the surface of the quartz sand filter material and the gap between the surface of the filter material change the flow and other characteristics of the filter material. During backwashing, these colloidal substances are pressed by the backwashing water and are easily attached to the gaps of the screen tubes, the pressure of the backwashing water increases (presses), and the flow rate decreases.

Therefore, the presence of polymers in the sewage is a direct factor for the compression of the filter tank during backwashing. The phenomenon of running materials is manifested in two aspects: one is running materials from the upper water collection pipeline during backwashing, and the other is running materials from the lower water distribution pipeline during filtration.

Quartz sand stone washing agent: In normal backwashing, the quartz sand filter material first expands under the action of backwash water, and the expansion rate is determined by the backwash strength. Generally, 20%-50% quartz sand filter material is suitable for water flow and Vibration, collision and friction are generated under the double action of gravity to form a hydraulic level. The dirt is discharged from the upper water collecting port and water collecting tank with the water flow. Each cleaning restores the pollution ability of the quartz sand filter material to a certain degree. At the same time, the filter material particles that form the hydraulic grade are returned to the support layer in order from large to small.

Quartz sand stone washing agent: Therefore, even if it is a filter tank with a light mouth tube and a perforated tube structure, there will be no phenomenon that the material is discharged from the upper water collection pipe during backwashing, and the material is discharged from the lower water distribution pipe during filtration.