Sewage Pump Selection: 1. When the equipment has a single pump configuration, there is no backup pump, suitable only for single-toilet sewage discharge in small volumes. Pump failure is easily manageable. 2. With a dual-pump setup, there's a backup pump. Both pumps can alternate or serve as backups. Ideal for use in unit basements with moderate water volume. In case of a single-pump failure, the other pump can adequately handle sewage discharge until the faulty pump is repaired. 3. Besides built-in, the equipment can also be installed externally. External installation means the vertical sewage pump is mounted outside the collection tank. Its advantage is easier maintenance, but the downside is increased noise. 4. The pump control cabinet system can be an indoor type or a stainless steel outdoor type.