What is the difference between a self-priming sewage pump and a submersible sewage pump?

The submersible sewage pump is literally imaginable, and it must be placed in the water when it is used. In actual use, we often use stainless steel submersible sewage pumps because stainless steel can transport corrosive liquids. Self-priming sewage pump, when using, you do not need to put the water pump in the water, it can directly sewage http://
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