4.5 Inch Diameter Filter Cartridge for Ultrafiltration Pre-treatment

4.5 Inch Diameter Filter Cartridge for Ultrafiltration Pre-treatment

This article introduces the 4.5 inch diameter filter cartridge, a wide-body high flow filter designed for ultrafiltration pretreatment in industrial water systems. A liquid filteradopting deep pleated polypropylene media, it provides expanded filtration area and outstanding contaminant holding capacity to protect downstream UF membrane components. Our 4.5 inch diameter filter cartridge can replace Equivalent ALN01-60B High Flow Cartridge for Ultrafiltration, widely deployed in seawater desalination, power plant condensate polishing and industrial wastewater reuse projects. The larger outer diameter reduces the total number of filter elements required, lowering installation and maintenance workload for water treatment facilities of all scales.

1. Product Introduction

The 4.5 inch diameter filter cartridge is a wide-diameter pleated high flow filter element developed as the security pre-filter for ultrafiltration water treatment equipment. Unlike conventional 2.5 inch standard filter cartridges, the 4.5 inch diameter filter cartridge greatly increases the radial filter area, which is the core reason for its remarkable high-flow performance. It is available in 20”,40”,60” lengths, making it flexible for small skid-mounted units, medium industrial UF systems and large full-scale water treatment plants.

This filter cartridge is fully interchangeable with High Flow Cartridge Filter Element for Ultrafiltration Pre-treatment, and matches the sealing and interface specifications of Ultipleat High Flow Filters for Ultrafiltration Pre-treatment. Installed immediately before ultrafiltration membrane racks, the 4.5 inch diameter filter cartridge captures sediment, rust, algae, fine silt and organic fragments in raw feed water. Without reliable prefiltration protection, hard solid particles will scratch UF membrane surfaces, block membrane pores and create irreversible membrane fouling. Severe fouling gradually reduces permeate flux, increases chemical cleaning frequency and shortens the service life of expensive ultrafiltration membrane modules. For customers looking for alternative pre-filtration products for UF systems, Pre-filtration Filter Cartridge for Industrial Ultrafiltration Systems is another reliable option for reference.

The 4.5 inch diameter filter cartridge adopts reinforced polypropylene inner core and outer support cage, which can withstand fluctuating differential pressure under continuous operating conditions. Gradient-density polypropylene pleated media delivers high dirt holding capacity while maintaining low initial pressure drop. Multiple micron grades ranging from 1μm to 100μm are available to adapt to different raw water quality. EPDM, silicone and Viton sealing gaskets are optional to meet varied liquid temperature and chemical medium requirements. Thanks to its 4.5 inch large outer diameter, each single cartridge can process much more water than traditional slim filter cartridges, cutting down the total number of filter housings needed for the same treatment capacity.

2. Working Principle

The 4.5 inch diameter filter cartridge operates based on pleated depth filtration principle, combining surface screening and deep adsorption interception. Raw water flows radially from the outer pleated surface of the 4.5-inch wide body, passes through multi-layer graded polypropylene material, and purified liquid flows inward into the central inner core and discharges out from the end port of the filter cartridge.

Large contaminants such as sand, rust and plankton are trapped on the outer pleated layer. Fine colloids and tiny suspended particles are captured inside the graded filter layers. The gradient density design allows pollutants to distribute evenly inside the filter media rather than accumulating only on the outer surface. The unique 4.5 inch wide diameter provides much larger pleat area, which greatly improves the dirt holding capacity and extends the filter service cycle, preventing rapid pressure rise within a short operation period.

In the ultrafiltration pretreatment workflow, the 4.5 inch diameter filter cartridge acts as the first protective barrier for ultrafiltration membranes. It controls the Silt Density Index (SDI) of inlet water and reduces particulate load entering UF membrane modules. When the differential pressure between inlet and outlet reaches the preset threshold, the filter cartridge needs replacement. Its wide-body design reduces cartridge quantity, simplifying inventory management and filter replacement operations for maintenance teams.

3. Technical Parameters

All parameters are tested under standard laboratory conditions. Actual flow rate and dirt holding capacity will be affected by raw water turbidity, temperature and impurity concentration. Our engineering team can customize micron rating, end cap connection and gasket material according to your on-site ultrafiltration project requirements.

4. Quality Assurance

All 4.5 inch diameter filter cartridge products are manufactured under ISO9001 quality management system. Raw filter media will be strictly inspected before production to check pinholes, uneven thickness and material defects. Every finished filter cartridge will go through bubble point integrity test, pressure resistance test and full visual inspection before shipment.

Automated pleating equipment ensures consistent pleat density for each wide-diameter filter element, guaranteeing stable flow performance and dirt holding capacity. Reinforced inner core prevents media collapse under variable operating pressure, which is a common failure mode of low-cost filter cartridges. All filter cartridges are cleaned and packed in dust-free workshop to avoid secondary contamination before delivery.

We provide batch inspection reports for each order. Third-party material testing can be arranged upon customer request. Our replacement filter elements deliver equivalent filtration performance as famous brand cartridges, with better overall cost performance. Our products are fully tested to prevent media shedding, which is essential to avoid secondary contamination to ultrafiltration membrane modules.

5. Application Fields

5.1 Ultrafiltration Pretreatment for Industrial Water

This is the core application. The 4.5 inch diameter filter cartridge serves as the security filter before ultrafiltration membrane units in municipal water treatment and industrial water reuse projects. It removes particles and colloids, stabilizes inlet SDI, protects UF membranes and reduces chemical cleaning frequency.

5.2 Seawater & Brackish Water Desalination

In desalination plants, this wide diameter filter cartridge filters raw seawater, intercepts sea sand, algae and suspended solids, to protect ultrafiltration and reverse osmosis membranes in the pretreatment skid.

5.3 Power Plant Condensate Water Treatment

Power plants use the 4.5 inch diameter filter cartridge for condensate polishing in auxiliary systems, removing iron oxide and particulate impurities, protecting boiler and downstream membrane equipment.

5.4 Skid-Mounted and Containerized Water Systems

For containerized and skid-mounted water treatment equipment, the 4.5 inch large diameter design reduces cartridge quantity, saving installation space and cutting down the maintenance workload.

5.5 Industrial Wastewater Reuse

For chemical, food and beverage wastewater recycling projects, it works as the pre-filter for ultrafiltration systems, lowering pollutant load and improving water recovery rate.

6. FAQ (6 Questions)

Q1: What role does the 4.5 inch diameter filter cartridge play in ultrafiltration equipment?

A: It acts as the primary security pre-filter for ultrafiltration systems. The 4.5-inch wide body provides large filtration area, intercepting suspended particles, silt and colloids, reducing SDI value of incoming water, preventing fouling and mechanical scratch damage to ultrafiltration membranes, and extending the service life of UF modules.

Q2: What advantages does the 4.5 inch diameter filter cartridge have over standard 2.5 inch filter cartridges?

A: The 4.5 inch outer diameter greatly increases the effective filtration area, delivering much higher single-element flow rate and larger dirt holding capacity. For the same water throughput, fewer filter cartridges and filter housings are required, saving equipment investment and maintenance labor.

Q3: Can the 4.5 inch diameter filter cartridge run continuously in seawater desalination pretreatment?

A: Yes. Polypropylene media has good salt tolerance. We can select matched sealing gaskets according to your seawater salinity and temperature. You can send your water quality report for our professional compatibility assessment.

Q4: Which micron rating should I select for ultrafiltration prefiltration?

A: 5μm or 10μm are the most popular options for ultrafiltration pretreatment. If raw water contains a large amount of coarse sediment, 20μm or 40μm is recommended. Our technical team will provide customized suggestions based on your water test data.

Q5: When should I replace the 4.5 inch diameter filter cartridge?

A: Replacement cycle depends on raw water impurity load. Normally, replace the cartridge when the inlet-outlet differential pressure reaches 2.5 bar. In general industrial water projects, its service life ranges from 1 to 3 months.

Q6: Can you customize the length and end cap of the 4.5 inch diameter filter cartridge for our existing filter housing?

A: Yes. We supply 20/40/60 inch lengths, and support custom end cap connection styles and multiple gasket materials including EPDM, silicone and Viton to fit your existing filter housing and working medium.

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