There are three main criteria for replacing a coalescer filter element: first, a pressure drop indicator alarm – when the differential pressure reaches a set value (e.g., 1.5–2.0 bar), indicating the coalescing layer is clogged; second, downstream water content exceeds the process requirement (e.g., above 15 ppm); third, the service life reaches the manufacturer's recommended interval (typically 6–12 months). It is recommended to regularly sample and test downstream water content, and combine pressure drop data to establish a replacement schedule.
