First, put 50 ~ 80g caustic soda into the sewer, and after 3 ~ 5min, pour water into the sewer with tap water, which can quickly clear the blockage. Soda will react with hot water, causing the temperature in the sewer to rise rapidly, which can melt the oil or other foreign matter in the sewer.

2, but when using caustic soda to dredge sewers, you must pay attention, because caustic soda is a strong alkali and has a corrosive effect. Remember not to go against the current, wear protective gloves when operating, and do not use hot water.