LEFILIER PP Melt-Blown Filter Cartridges: 3-Layer Gradient Filtration for Enhanced Dirt-Holding Capacity

1. Introduction

LEFILIER’s PP Melt-Blown Filter Cartridges feature a unique “outer-loose, inner-dense” three-layer structure—outer layer traps large particles (sediment, rust) to reduce flow resistance, middle layer intercepts medium contaminants (colloids), and inner layer blocks fine particles (down to 1μm) and microorganisms. This design boosts dirt-holding capacity by 30% vs. single-layer filters, extending service life. Ideal as a pre-filter for RO systems in drinking water purification or standalone solutions for industrial fluid treatment.

2. Features

① Gradient Filtration Efficiency

A three-layer structure (loose outer layer → compact middle layer → precise inner layer) traps impurities incrementally:

• Outer layer: Captures large particles (sediment, rust) to reduce initial flow resistance.

• Middle layer: Intercepts medium-sized contaminants (colloids, organic debris).

• Inner layer: Blocks fine particles (down to 1μm) and microorganisms.
  This design boosts dirt-holding capacity by 30% vs. single-layer filters, extending service life.

② Food-Grade Safety

Constructed from 100% pure PP, the cartridge meets FDA standards, ensuring no secondary contamination. Ideal for potable water, food, and pharmaceutical applications.

③ Enhanced Pressure Resistance

An inner-threaded structure reinforces mechanical strength, withstanding up to 0.5 MPa differential pressure without deformation—minimizing bypass risks.

④ Needle-Punched Surface

The needle-punched design increases the effective filtration area by 25%, promoting smooth flow and reducing clogging in high-particulate environments.

3. Technical Data

4. Working Principle

The PP melt-blown cartridge operates via a gradient porous mechanism:

1. Fluid Inflow: Contaminated fluid enters the outer loose layer, where large particles (e.g., sediment, rust) are trapped.

2. Intermediate Filtration: As fluid moves to the compact middle layer, medium-sized impurities (colloids, organic debris) are mechanically intercepted.

3. Fine Filtration: The precise inner layer blocks fine particles (≥1μm) and microorganisms, ensuring ultra-clean output.

Over time, accumulated contaminants increase the pressure differential across the cartridge—indicating the need for replacement.

5. Application Field

① Drinking Water Purification

• Pre-filtration for RO systems in households and commercial plants, protecting membranes from sediment and turbidity.

② Industrial Fluid Treatment

• Filters acidic/alkaline solutions, plating baths, and chemical solvents in petrochemical, metallurgy, and electroplating industries.

③ Food & Beverage

• Clarifies juice, beer, and dairy products, ensuring compliance with FDA/HACCP standards.

④ Electronics & Pharmaceuticals

• Produces ultra-pure water for semiconductors and injectable drugs, removing particles >1μm.

⑤ Wastewater Recycling

• Treats industrial wastewater (printing ink, tannery effluent) for reuse or discharge compliance.

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6. Q&A

Q1: How often should I replace the filter?

A: Replace when the pressure differential reaches 0.2MPa or after 3–6 months of continuous use (varies by fluid quality). Monitor pressure gauges for timely changes.

Q2: Can it filter bacteria and viruses?

A: Yes! A 1μm precision cartridge blocks most bacteria (e.g., E. coli, 1–5μm) and protozoa. For viruses (<0.1μm), pair with RO or UV disinfection.

Q3: Is the material safe for drinking water?

A: Absolutely. The PP material is FDA-approved, non-toxic, and chemically inert—no leaching into potable water.

Q4: Can I customize the filter?

A: Yes! We offer custom lengths (5”–60”), precision (1–50μm), and connection types (e.g., 226, 222 threads) to match your system.

Q5: What’s the maximum operating temperature?

A: The cartridge handles up to 80°C. For higher temperatures, contact us for heat-resistant material options.