The APSW Series String Wound Filter Cartridge is a high-performance filtration solution specially designed for power plant condensate polishing systems, steel plant cooling water treatment, and high-temperature industrial water filtration applications.
Available in 60-inch and 70-inch extra-long configurations, the APSW Series cartridge is manufactured by continuously winding high-purity polypropylene fibers onto a robust stainless steel inner core, creating a uniform and stable depth filtration structure with excellent dirt-holding capacity and long service life.
The string wound filtration structure effectively removes iron oxides, rust particles, copper contaminants, metal corrosion products, and other suspended solids from condensate water. It is particularly suitable for thermal power plant condensate polishing systems and steel plant process water filtration, where high filtration efficiency and reliable operation are required.
The APSW Series supports resin pre-coating before filtration and utilizes the full-length active filtration area to achieve filtration efficiency of over 98%. This helps improve condensate water quality, reduce corrosion risks in boiler systems, and maintain stable operation of critical equipment.
Equipped with a stainless steel threaded center core and reinforced connection structure, the cartridge provides excellent mechanical strength, pressure resistance, and structural stability under demanding operating conditions. The APSW Series can be directly installed into existing filtration systems without modification, making it an ideal choice for industrial condensate polishing and iron removal filtration applications.

The APSW Series uses a high-strength stainless steel inner core tube and support structure to enhance overall cartridge durability.
· Excellent mechanical strength and pressure resistance
· Maintains structural integrity under high differential pressure conditions
· Suitable for continuous operation in demanding industrial environments
The filter cartridge is manufactured using continuous polypropylene fiber winding technology to create a stable and uniform filtration layer.
· Prevents fiber breakage during operation
· Minimizes fiber shedding and contamination risks
· Provides consistent filtration performance throughout service life
· Suitable for high-purity condensate filtration applications
The 60-inch and 70-inch extra-long design provides a larger effective filtration area and improved contaminant holding capacity.
· Uniform flow distribution along the entire cartridge length
· Efficient removal of iron oxides, rust particles, and suspended contaminants
· Filtration efficiency exceeding 98%
· Extended service life and reduced replacement frequency
The specially selected polypropylene fiber media provides excellent stability for industrial water treatment applications.
· Good thermal stability
· Wide chemical compatibility
· Suitable for power plants, steel plants, and petrochemical process water systems
The reinforced stainless steel structure improves the cartridge’s pressure resistance and operational reliability.
· Maximum differential pressure up to 0.30 MPa
· Suitable for high-flow and continuous filtration systems
· Maintains excellent structural performance during long-term operation
APSW | 60 | 5 | G | 70 | ** | ** |
Model | Outer Diameter | Removal Rating | Media | Length | Connection Configuration | End thread |
APSW | 50 = 50mm 60 = 60mm | 1 = 1um 5 = 5um | G = PP B = Cotton yarn | 60 = 60"(1524mm) 70 = 70"(1778mm) | D15 = M33x1.5 D20 = M33x2 G1 = G1 | DE = M8 DT = M10 DS = M6 |
■ Maximum Operating Temperature: 80°C(PP) , 120°C(Bleached cotton) ■ Maximum Differential Pressure: 3.0 bar @25 ℃ ■ [Material of Constructions] Core: Stainless Steel 304 or 316L ■ Outer diameter and connection interfaces can be customized upon request. | ||||||
The APSW Series String Wound Filter Cartridge is widely used in thermal power generation applications, including:
· Power plant condensate polishing systems
· Boiler condensate filtration systems
· Supercritical and ultra-supercritical boiler condensate treatment
· Cooling water filtration systems
Designed for industrial water purification and corrosion control applications:
· Steel plant condensate and cooling water treatment
· High-temperature process water filtration
· Continuous casting and rolling mill circulating water filtration
· Removal of iron oxides and metal corrosion particles
Suitable for demanding industrial applications:
· High-temperature process water filtration
· Steam condensate treatment
· Chemical industry circulating water purification systems
Designed specifically for demanding industrial filtration environments, the APSW Series provides reliable performance advantages:
· 60-inch and 70-inch extra-long configurations reduce the number of cartridges required in large filtration systems
· Stainless steel inner core design ensures superior mechanical strength and pressure resistance
· Deep filtration structure effectively removes iron oxides, rust particles, and metal contaminants
· Supports resin pre-coating technology for advanced condensate polishing applications
· Suitable for high-temperature, high-flow, and continuous industrial filtration operations
The APSW Series is a reliable filtration solution for power plant condensate polishing, iron removal filtration, steel plant water treatment, and high-temperature industrial process water applications.
AAL Filter specializes in manufacturing high-quality filter cartridges, filter cartridge components, and industrial filtration solutions for global filter manufacturers, engineering companies, and end users.
Our product range includes:
· Power Plant Condensate Polishing String Wound Filter Cartridge (APSW Series)
· 304/316L Stainless Steel Inner Core for String Wound Filter Cartridge
· PP Filter Cartridge Core
· Stainless Steel Support Cage
· Filter Cartridge End Caps and Components
· High Flow Filter Cartridge Components
With advanced manufacturing capabilities, strict quality control systems, and extensive experience in industrial filtration applications, AAL Filter helps customers improve filter reliability and meet the requirements of power generation, steel manufacturing, petrochemical, and water treatment industries.
Whether you need standard filter cartridges, replacement solutions, or technical support for specific condensate filtration systems, contact AAL Filter today to get product specifications, samples, and professional filtration solutions.