TPS series are solar screw pumps. The characteristic of screw pump is high head and small flow. Suitable for domestic water supply. TPPC series are solar-powered plastic impeller solar deep well pumps. It is cost-effective, has a long service life, is more durable than a screw pump, and has a larger flow rate. However, the head is relatively small. TPSC series are solar submersible pumps with stainless steel impeller. Stainless steel impellers are more durable than plastic impellers, especially in waters with high sand content.