Yes, the Simple Pump deep well hand pump can be installed alongside a working submersible pump. This configuration is desirable to have the Simple Pump as a backup pump in case your submersible stops working or you lose power to your submersible pump due to weather or some other reason.
The submersible pipe and the Simple Pump drop pipes are installed next to each other in the well. The submersible pump can continue to be used in your existing system with the Simple Pump. The Simple Pump provides access to your well water if you lose power or if your submersible pump stops working.