Sewage Ejector Selection: 1. When the equipment features a single pump without a backup, it's limited to a single toilet's waste discharge, with a small volume of waste and easy troubleshooting if the pump fails. 2. With dual pumps, there's a backup option, allowing the pumps to alternate or serve as backups. Suitable for unit basements with moderate water volume; if one pump fails, the other can handle waste discharge adequately until the faulty pump is repaired. 3. Besides internal installation, the equipment can also be externally mounted, meaning the vertical pipeline sewage pump is assembled outside the collection tank. The advantage is easier maintenance, but the downside is increased noise. 4. The pump control cabinet system can be chosen in an indoor model or a stainless steel outdoor type.