PP String Wound Water Filter Cartridge

Product Overview

AALfilter's 50"/70" PP String Wound Water Filter Cartridge is specifically engineered for RO pre-filtration in seawater desalination systems, offering exceptional sediment removal and membrane protection. 

Made from high-purity polypropylene yarn, it provides high dirt-holding capacity, excellent chemical resistance, and low extractables—making it ideal for high-volume, corrosive liquid environments. 

The depth-wound structure ensures effective filtration from the outer to inner layer, capturing both large and fine particles.

Compatible with standard cartridge filter housings, this filter cartridge is commonly used in municipal desalination plants, marine watermakers, and industrial RO systems to extend membrane life and reduce system fouling.

Key Features:

✅ Material: 100% polypropylene

✅ Temperature Resistance: Up to 60°C (140°F) 

For higher temperature applications, consider our cotton wound filter cartridge, which can withstand up to 120°C.

✅ Chemical Compatibility: Broad compatibility with acids, alkalis, and solvents

✅ Filtration Efficiency: High retention efficiency with no fiber migration

✅ Applications: Pre-RO filtration, food & beverage, chemical processing, wastewater treatment, and petrochemical processes

Specifications:

Tech Support

Our team is available for troubleshooting, technical assistance, and to help you select the right filtration solutions for your applications.

Applications

✅ Power Generation: Used for cooling water filtration to remove suspended solids and particles, protecting heat exchangers and boiler systems.

✅ Industrial Manufacture: Used for process water filtration to remove metal particles, sand, and impurities in machining processes.

✅ Petrochemical: Used for chemical filtration, such as pre-filtration of acids, alkalis, and solvents, to protect downstream equipment.

✅ Food & Beverage: Used for filtering beverages, syrups, and edible oils to ensure product purity.

✅ Water Treatment: Used as pre-filtration for reverse osmosis (RO) systems to remove suspended solids, silt, and rust, extending RO membrane life.

✅ Mining: Used for mine water treatment to remove silt and suspended solids, protecting pumps and pipelines.

✅ Oil & Gas: Used for filtering completion fluids, injection water, and acrylates to ensure fluid cleanliness.

✅ Pulp & Paper: Used for filtering process water in papermaking to remove fibers and impurities, improving paper quality.

🟦 Why Choose PP String Wound Filters?

• ✅ Wide chemical resistance – Suitable for brackish water, seawater, and pre-treated liquids

• ✅ No adhesives or surfactants – Low extractables, ideal for sensitive RO systems

• ✅ High dirt-holding capacity – Reduces filter change-out frequency

• ✅ Available in multiple micron ratings – From coarse to fine (1–100μm)

• ✅ Cost-effective – Long life cycle and minimal maintenance

These features make PP string wound filters a preferred choice for industrial desalination plants, offshore watermakers, and municipal water treatment projects.