How Self-Cleaning Filters Achieve "Self-Cleaning"

JX Filtration January 22, 2026 Self Cleaning Filter

A self-cleaning filter automatically removes trapped solids to maintain flow without manual intervention. The core process is a cycle: Monitor → Trigger → Clean → Reset.

1. Monitor & Trigger
The system continuously monitors itself, typically via a differential pressure sensor across the filter screen. When clogging increases the pressure drop to a set point, or after a timed interval, the control system triggers a cleaning cycle. Main filtration often continues during this brief cycle.

2. The Cleaning Action (Mechanical or Hydraulic)
The key is a dedicated internal cleaning mechanism. Common types include:

Scraper: A blade physically scrapes solids off the screen's inner surface.
Brush: A rotating brush scrubs the screen clean.
Suction Nozzle (Most Common): A nozzle traverses the screen, using system pressure or a vacuum pump to create a reverse flow that sucks debris off the screen.

3. Waste Removal & Reset
The dislodged waste is flushed out through an automatic discharge valve. Once cleaning is complete, the mechanism resets, the valve closes, and the filter returns to full-flow filtration, ready for the next cycle.

In summary, the filter automates the fouling reversal by integrating a sensor, a controller, and a dedicated cleaner (Scraper/Brush/Suction Nozzle) to perform brief, in-service cleanings, ensuring uninterrupted operation.