How to avoid cavitation submersible pump

The corrosion phenomena exist everywhere in nature, not only in the field of biology, so it is non biological, submersible pump if not careful will appear cavitation phenomenon, which is not very good for us, it should be how to avoid?
1, can be polished, clean, improve the surface of the finish.
2, increase the diameter of the impeller inlet to achieve the purpose of reducing the flow rate at the inlet.
3, to reduce the speed of the submersible pump to reduce its inlet flow rate, you can also increase a booster pump, in order to improve the efficiency of the main pump.
4, at the entrance to increase the induction wheel, adjust the blade installation angle.
7, by reducing the pumping liquid temperature, so that the pressure of gasification decreased.
8, think of ways to reduce the resistance of the suction pipe, such as increasing the suction pipe diameter, reducing the valve in the suction pipe, elbow, etc..
9, submersible pump installed in the lower position, like the use of intrusion, but also reduce the cost.
Above several ways can avoid the problem of submersible pump from the problem of cavitation, of course, how to improve the performance of submersible pump is very important, and this is more reflected in the details of the treatment.