Wastewater Elevator Selection: 1. If the equipment is configured with a single pump, there is no backup pump, limiting it to wastewater discharge within a single bathroom. The wastewater volume is small, and pump failures are easy to address. 2. When the equipment is equipped with dual pumps, a backup pump is available, allowing the pumps to alternate work or act as backups for each other. Suitable for use in unit basements with moderate water volume. In case of a single pump failure, the other pump can run to handle wastewater discharge adequately, and the faulty pump should be repaired promptly. 3. Besides the built-in type, the equipment can also be made as an external type. The external type features a vertical pipeline wastewater pump mounted outside the collection tank, with the advantage of easier maintenance and repair but the drawback of higher noise levels. 4. The pump control cabinet system can be selected in an indoor type or a stainless steel outdoor type.