What is the term for the difference between the filter influent and effluent pressure gauges?

The term that represents the difference between the filter influent and effluent pressure gauges is known as pressure differential. This measurement is crucial for assessing the performance of a filtration system in a pool.

When water flows through a filter, the pressure reading before the water enters the filter (influent) will typically be higher than the pressure reading after the water has passed through the filter (effluent) due to the resistance created by the filter media. The difference between these two pressure readings indicates how effectively the filter is operating. A significant drop in pressure differential can suggest that the filter is becoming clogged and may require cleaning or replacement to maintain optimal performance.

In contrast, flow rate refers to the volume of water passing through the system over a given time, and while it is an important metric, it does not directly describe the difference in pressure between the influent and effluent. Pressure gradient usually describes a change in pressure in a direction rather than a measurement between two specific points, while water clarity pertains to the visibility of the water and does not relate to pressure measurements at all. Therefore, pressure differential is the precise term that encompasses the relationship between the influent and effluent pressures in a filtration system.