Polypropylene Cartridge

Polypropylene Filter Cartridge (PP Cotton Filter)

Polypropylene filter cartridges-also known as PP cotton filters-are essential components in water filtration systems, especially as the first-stage pre-filters in reverse osmosis (RO) systems. Made from non-toxic, odorless polypropylene particles, these melt-blown cartridges are manufactured through a precise process of heating, melting, spinning, and molding to form a dense, tubular filter.

1. Effective Removal of Particulate Impurities

PP filter cartridges efficiently remove sediments such as rust, sand, and dirt from tap water. The filter is designed with a gradient structure-larger pores on the outer layer and finer pores on the inner core. This design enables multi-layer filtration, trapping both large and microscopic particles as water flows through.

Filtration precision:

• 1 micron
• 5 microns

These filters are typically used as the first-stage filter in water purifiers to protect the main RO membrane and extend its lifespan.

2. Multi-Layer Structure with Strong Dirt-Holding Capacity

The outer layer is loose while the inner layer is dense, forming a gradual gradient structure. Each layer intercepts impurities, significantly increasing the cartridge's dirt-holding capacity. This ensures longer use and more efficient filtration.

3. High Flow Rate with Low Pressure Drop

Thanks to its high porosity and three-dimensional microporous structure, the PP cartridge allows water to pass through easily, maintaining a strong flow rate without causing a significant drop in water pressure.

Performance specs:

• Maximum pressure difference: ≤ 0.4 MPa
• Inlet water pressure: 0.1 – 0.5 MPa
• Pressure loss: ≤ 0.05 MPa

4. Safe, Hygienic, and Chemical-Free

PP filter cartridges are made without adhesives or chemical additives. The self-bonding polypropylene material meets food-grade hygiene standards, ensuring the filtered water is safe and free from secondary contamination.

5. Excellent Chemical Resistance

Polypropylene material offers strong resistance to acids, alkalis, oils, and organic solvents (excluding strong sulfuric and nitric acids). This makes PP cartridges suitable for use not only in household water purifiers but also in industrial applications such as chemical processing and electronics manufacturing.

• Reverse osmosis systems (RO systems)
• Ultrafiltration systems
• Pre-filtration in residential and commercial water purifiers
• Food and beverage water treatment
• Electronics and chemical industries

Thanks to their low cost, high performance, and customizable design, PP filter cartridges are widely adopted by water purifier manufacturers. We provide OEM manufacturing for global brands with reliable quality and excellent service.

The PP filter cartridge is the first line of defense in your water purifier and handles the bulk of particulate filtration. Therefore, it tends to clog faster than other filters.

• In areas with poor water quality, replace every 2–3 months.
• In areas with better water quality, replace every 4–6 months.

Timely replacement helps avoid clogging, secondary pollution, and ensures optimal performance of the entire filtration system.

We specialize in OEM production of polypropylene filter cartridges for global water purifier brands. With strong R&D, quality assurance, and global shipping capabilities, we are your trusted partner for customized water filtration solutions.

👉 Contact us today to request samples or discuss custom OEM requirements.

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