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It is better not to wash with hydrochloric acid. Cleansing is easier to use.
It will affect the discharge, and it is still very affecting.
1.If the material of the sewage pipe is PVC, it is best to buy an elbow like it and replace it. >>>More
Generally, the length of the waterproof casing is 25-30cm, minus the thickness of the floor slab, and it is generally exposed 13-18cm
The sewage pipe on the second to tenth floors is also the exhaust outlet that leads to the roof of the building, whether it is blocked or modified by anyone (such as the transformation of elbows or too many bends) will cause the phenomenon you are talking about now often bubbles and even backflow. The national standard slope is between 2% and 3%.
Go to the big stationery store and buy a large bottle of oil painting color, the scientific name is acrylic color, and you can brush it with water. The color is optional, recognized as environmentally friendly, dry and not afraid of water, stronger than paint.