This depends on the technical package you have. Most systems will run off an automatic pressure-sensitive pump, which will pump water on demand to the application by opening and closing of a valve. The pump will sense the opening of that valve and it will pump water on demand until the valve closes, then it will shut off.
With more advanced systems, we can supply a control panel to give you a bit more in-depth detail of what is going on in terms of the use of the rainwater versus how much mains water you are potentially saving. It can also detect the level of water in the ground tank as well as opening and controlling solenoid valves for automatic cleaning of the filters.
For standard systems, it would be the submersible pump options. Whereas with more advanced systems, you can have a lot more technology with the control system to get a better idea of how efficiently your system is working.
