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In fact, the characteristics of kitchen sewage is more oil and sewage, grease condensation easy to block the pipeline, in the domestic grease blocked the water is a common problem, so unilateral drainage may not be too good, grease with sewage flow not only waste, not environmental protection, but also easy to cause pipe blockage. In the treatment of kitchen sewage discharge, it is recommended to use the sewage hoist + oil-water separator together.