The ZW self-priming vortex non-clogging sewage pump, also known as a solids pump or impurity pump. This series has a uniquely designed hydraulic system where the impeller is enclosed in a separate impeller chamber, which is connected to the pressure water chamber. When the impeller rotates, it generates a strong axial vortex effect within the pump, creating a vacuum at the inlet and generating head pressure at the outlet. Consequently, impurities can be discharged from the pressure water chamber, ensuring that its flow passage remains completely unobstructed.