Wastewater Elevator Selection: 1. When the equipment is single-pump configured, there is no backup pump, limiting it to wastewater discharge within a single toilet. The wastewater volume is small, and pump failures are easy to handle. 2. With dual-pump configuration, there is a backup pump, allowing for alternating operation or mutual backup. Suitable for use in unit basements with moderate water volume. In case of a single pump failure, the other pump can run to adequately handle wastewater discharge, and the faulty pump should be repaired promptly. 3. Besides built-in, the equipment can also be external. An external setup involves vertical pipeline wastewater pumps mounted outside the collection tank. The advantage is that maintenance is more convenient, but the drawback is increased noise. 4. The pump control cabinet system can be selected in an indoor type or stainless steel outdoor type.