First, press the handle on the cylinder head controller and push it to the filter for normal filtration, then start the water pump, and water will be introduced into the water inlet of the sand cylinder through the water pump, then flow from the water inlet to the water separator and then into the sand cylinder. After the water is filtered by the sand layer, it will flow into the bottom of the sand cylinder and then enter the main filter pipe through the filter pipe. The water will flow upward to the outlet in the pipeline, and then be transported to the lower-level treatment equipment by the pipeline system, or flow back to the water tank.

2. After a period of time, the accumulated dirt will affect the flow of water. It's time to clean the sand tank. First, turn off the water pump, press the handle on the cylinder head controller for backwashing, and then turn on the water pump. Water enters the water separator at the bottom of the sand cylinder from the main filter pipe, and the water washes up the sand layer from the bottom to discharge the dirt in the sand layer. At this time, dirty water can be seen in the transparent part of the drain pipe. After backwashing, turn off the water pump, press and flush the handle of the cylinder head controller, turn on the water pump to flush the dirt in the pipeline and discharge the sand cylinder. After about half a minute, turn off the water pump, press the handle on the cylinder head controller for normal filtration, and open the water valve.