What does the Large Turbo Meter primarily track?

The Large Turbo Meter is specifically designed for measuring high flow rates, which makes it particularly suitable for monitoring all water usage from a fire line during firefighting activities. Firefighting requires a substantial volume of water to be utilized in a short period, and the Large Turbo Meter is capable of accurately tracking and recording this high flow, ensuring that water usage can be accounted for effectively.

In contrast, the other options center on lower flow scenarios or specific processes that do not align with the capabilities of the Large Turbo Meter. For instance, low flow domestic use would not typically require such a large meter, as it is designed for much smaller volume measurements. Medium flow recycling processes also do not demand the same high capacity measuring capabilities that the Large Turbo Meter provides, and excess water leaving the system does not encompass the specific tracking of fire line usage that is the focus of the meter's functionality. Thus, option C reflects the Large Turbo Meter's intended purpose, while the others do not accurately capture its primary use case.