Because the grease trap is a big expense for some small catering industries, and it also needs post-maintenance. However, the benefit of grease trap to catering enterprises is only to protect the pipeline (environmental protection is not the concern of catering enterprises). Therefore, in the case that the requirements of the environmental protection department or the supervision is not very strict, catering enterprises will naturally not install grease traps.

Therefore, urban pipelines are often blocked, and the smell in some areas is also very bad. Therefore, it is necessary to strengthen control in this regard. Sewers are the conscience of a city.