A:1. Their materials are different. They are made of stainless steel and cast iron. Most parts of stainless steel submersible pumps are made of stainless steel, and the non-magnetic steel has no magnetism. The sound of tapping is very clear and crisp. However, the water pump made of cast iron is magnetic and the sound of knocking is dull.
2.Cast iron material can only be used to pump clean water, or general sewage, but stainless steel pump can be used in chemical industry, which is one of the advantages of stainless steel submersible pump, with corrosion resistance.