Wastewater Elevator Selection: 1. If the equipment is single-pump configured, there is no backup pump, limiting it to single-toilet wastewater discharge within the bathroom. The wastewater volume is small, and pump failures are easy to handle. 2. With dual-pump configuration, a backup pump is available, allowing the pumps to alternate or act as backups. Suitable for unit basements with moderate water volume. In case of a single-pump failure, the other pump can run to handle wastewater adequately, and the faulty pump should be repaired promptly. 3. Besides built-in models, the equipment can also be 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 increased noise. 4. The pump control cabinet system can be chosen in an indoor type or stainless steel outdoor type.