A submersible pump apparatus providing a motor assembly, a pump assembly, and a plastic pump housing. The motor assembly is either a canned motor assembly or a four inch motor assembly. The canned motor assembly is designed to prevent the immediate destruction of the submersible pump apparatus upon the occurrence of the breaching or leaking of the seals. The pump assembly is designed with either a single stage pump or multiple stage pump that utilizes a unique combination of propellers and intermediate flow straighteners, and driving mechanisms for the same. The plastic pump housing is designed to accommodate attachment of either the canned motor assembly or the four inch motor assembly to the same pump assembly.