Some common water-saving technologies used in water-cooled HVAC systems include flow controllers, pressure-independent control valves, and water-side economizers. These technologies help to optimize water flow rates, reduce water consumption, and minimize waste. For example, flow controllers can detect changes in system demand and adjust water flow rates accordingly, while pressure-independent control valves ensure consistent water pressure and flow rates throughout the system. Water-side economizers, on the other hand, use cool outside air to reduce the load on the chiller and conserve water.