Knowledge
Classification of drain pipes
Water escape drain pipe
Clean water drain pipe
Sewage drain pipe
large-scale drainage
Rainfall drain pipe
Methods of drainage cleansing
Physical methods( high pressure, pressure gradient, direct contact with tools)
Chemical methods( sulphuric acid and other corrosive liquid) (very dangerous)
Reasons of clogging
Physical clogging
Oxidizing of drain pipe
Drain pipe destroyed(usually led by other construction project)
Low pressure or low capacity in toilet tub
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