Wastewater Elevator Selection: 1. When the equipment is configured with a single pump, there is no backup pump, suitable only for single toilet wastewater discharge within a single bathroom. The wastewater volume is small, and pump failures are easy to handle. 2. If the equipment is equipped with dual pumps, a backup pump is available, allowing the two pumps to alternate or act as backups for each other. This is suitable for use in unit basements with moderate water volume. In case of a single pump failure, the other pump can run sufficiently to handle wastewater discharge, and the faulty pump should be repaired promptly. 3. Besides the built-in type, the equipment can also be made external, where the vertical pipeline wastewater pump is assembled outside the collection tank. The advantage is that maintenance is more convenient, but the drawback is that it is noisier. 4. The pump control cabinet system can be chosen in an indoor type or a stainless steel outdoor type.