How Does Depth Filtration Work?

• Depth filtration is a method that utilizes the entire thickness of the filter media to capture contaminants. Through the porous structure and irregular flow paths within the medium, particles of various sizes are gradually removed. In this process, larger particles are trapped near the outer layers, while finer particles are captured in the inner layers, enabling multi-stage filtration. This structural characteristic provides higher dirt-holding capacity and longer service life compared to filtration methods that rely solely on the surface.
• In addition, depth filter media are often designed with a gradient density structure, which helps delay clogging of the filter and maintain a stable flow rate. As a result, they can operate efficiently even with high-viscosity liquids or fluids with a heavy particle load, making them particularly suitable for pre-filtration processes or long-term operation. Representative products that apply this principle include melt-blown cartridge filters and string-wound cartridge filters.