Sewage pump and slurry pump have very high clean water efficiency, some even close to the efficiency of clean water pump.

1) The ordinary clean water pump is designed to obtain the highest efficiency, that is to say, the hydraulic structure parameters of the clean water pump are the best combination of obtaining the highest efficiency. The efficiency of the pump with special requirements for sewage pump and slag slurry pump cannot exceed the efficiency of the clean water pump at the same time. This comparison refers to the advanced level of the time and not to the level of one person's design.

2) With the continuous improvement of theoretical research and the continuous deepening and accumulation of experimental conclusions, especially the application of the two-phase flow theory, the situation is inevitable for the continuous improvement of the efficiency level of sewage pump and sludge pump.

3) The main reason that the efficiency of sewage pump and slag slurry pump is lower than that of clean water pump is that their passage is widened. The value of efficiency decrease is mainly related to the degree of widening. Therefore, it is meaningless to compare the efficiency of two different sewage pumps and slurry pumps without the limitation of passing capacity.

4) The flow channel of sewage pump is widened to prevent blockage, so the efficiency of the original sewage pump is usually lower than that of the secondary sewage pump.

5) The widening of mud pump runner is mainly to reduce the two-phase flow velocity in the runner to reduce wear. Therefore, the efficiency of strong abrasive slurry pump is usually lower than that of soft mud pump.

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