Opened the septic tank cover with an iron hook and then dispersed the adhered layer of debris in the septic tank using a long bamboo pole (8 meters).

2. Paved the vacuum truck to the pipeline, Shanghai's high-pressure, cleaning site, and placed the sewage suction hoses (5 meters long, with 3 spare) into the septic tank.

3. Turn on the sewage suction truck, extracting the feces until the fecal matter in the septic tank is mostly removed, to prevent dirt from staining the clothes of workers and pedestrians.

4. Cover the septic tank lids, and rinse the construction site and all tools with clean water.

5. Cleaning is typically conducted every six months in the septic tank, but this depends on the usage. If the volume is large, it is necessary to shorten the cleaning interval to avoid overflow. 90% of the main tank, 75% of the auxiliary tanks, and all hard surfaces of the third-level tanks.

6. After clearing, it was visually confirmed that there were no products floating in the well, and both the inlets and outlets were clear to prevent any overflow of wastewater onto the ground.