Large Diameter High Flow Filter Cartridge for RO Pre-treatment Systems

Product Introduction

This large diameter high flow filter cartridge is designed to fit standard water filter housing, and it usually works in series with an upstream self-cleaning filter to build a complete graded filtration train. The self-cleaning filter intercepts coarse sediment, large fibers and bulk impurities via automatic backwashing, while the high flow filter cartridge carries out precision safety filtration to trap fine particles that pass through the upstream equipment. The cartridge features a 152mm outer diameter and single-end opening, with liquid flowing from inside to outside during filtration. Thanks to the large-diameter design, the effective filtration area is significantly increased, which reduces the total number of filter cartridges required and minimizes the footprint of the water filter housing. In many working conditions, its high flow capacity and extended service life help end users reduce capital investment and daily maintenance labor cost. It adopts a gradual pore size structure, with filter media made of folded depth polypropylene or melt-blown polypropylene. The unique inside-out flow pattern ensures that all captured contaminants are retained inside the filter medium, preventing particle re-release into the downstream pipeline. It supports three standard lengths: 508mm, 1016mm and 1524mm, and multiple micron ratings ranging from 1μm to 100μm. It is the ideal safety filter choice for RO membrane protection, seawater desalination, condensate filtration, pharmaceutical raw material liquid, edible oil, beverage and petrochemical liquid filtration.

Working Principle

The core filtration direction of this high flow filter cartridge is inside-out. Unfiltered liquid enters the inner cavity of the cartridge from the central opening, then passes radially outward through the gradient pleated filter media. As the liquid flows through the multi-layer medium, particles of different sizes are trapped gradually inside the filter material. The graded pore structure holds contaminants steadily inside the medium, avoiding surface blinding and extending the service cycle.

In the complete multi-stage filtration system, the upstream self-cleaning filter acts as the first coarse barrier. It automatically backwashes at preset differential pressure or time intervals to discharge sand and large debris without disposable consumables. The downstream water filter housing loads this high flow filter cartridge to perform fine safety filtration before entering downstream equipment such as RO membranes.

With the continuous accumulation of intercepted particles inside the filter medium, the differential pressure between inlet and outlet rises gradually. Once the pressure difference reaches the upper limit, the cartridge needs to be replaced. The differential pressure gauge mounted on the water filter housing provides real-time clogging monitoring, so maintenance can be arranged in advance without unexpected shutdown. The inside-out flow design also brings an extra benefit: if the filter medium is damaged accidentally, the captured particles will not flush directly into the downstream pipeline.

Main Structure

Filter Medium: 

Folded depth polypropylene or melt-blown polypropylene, gradual pore gradient structure.

Support & Drainage Layer: 

Polypropylene material, supports the pleated medium and optimizes liquid distribution.

End Cap: 

Glass fiber reinforced polypropylene, high strength, anti-deformation under high flow impact.

O-ring Seal: 

EPDM or Buna N optional, reliable sealing between cartridge and water filter housing to prevent liquid bypass.

Central Core: 

Integrated support structure, maintains round shape under high flow rate.

Core Advantages

Ultra-high Single Cartridge Flow: 

The 40-inch cartridge can reach up to 110 m³/h, far higher than traditional 2.5-inch small filter cartridges.

Compact System Layout: 

The overall size of the filtration system can be reduced by up to 50%, saving installation space and cutting housing cost.

Gradient Pore Structure: 

Deep depth filtration, high dirt holding capacity, longer service interval between replacements.

Inside-out Flow Mode: 

Contaminants are locked inside the medium, greatly reducing the risk of downstream particle contamination.

Wide Chemical Compatibility: 

All-polypropylene main body, compatible with most water-based liquids, solvents, food and pharmaceutical liquids.

Multiple Length & Micron Options: 

508mm, 1016mm, 1524mm lengths, precision from 1μm to 100μm, flexible for diverse requirements.

Certified Stable Performance: 

Passes ISO 02941, ISO 2942 and other international filter test standards, consistent filtration performance.

Perfect Matching with Self-cleaning Filter: 

Two-stage filtration reduces pollutant load and maximizes the service life of the high flow filter cartridge.

Technical Specification Table

Application Scenarios

RO Safety Filtration & Seawater Desalination Pre-treatment: 

Protect reverse osmosis membranes from particle fouling.

Power Plant Condensate Filtration: 

Fine filtration of condensate water in thermal power stations.

Biopharmaceutical Industry: 

Filtration of pharmaceutical API, solvent and process water.

Food & Beverage Industry: 

Purification of bottled water, sugar liquid, edible oil, fruit juice and dairy drinks.

Coating, Paint & Petrochemical Industry: 

Filter solid particles from paint, chemical process fluid.

Microelectronics Industry: 

Pre-filtration for ultra-pure water, film, fiber and resin production lines.

Buying & Selection Guide

When selecting this high flow filter cartridge, buyers need to confirm the required micron rating, cartridge length, O-ring material, liquid temperature, pH value and the specification of the water filter housing. If the raw liquid contains a large amount of sediment and coarse impurities, it is strongly recommended to install a self-cleaning filter on the upstream side. It removes large solids and reduces the contaminant load of the high flow cartridge effectively. For general water treatment, EPDM seals are the preferred cost-effective option. For oil-containing hydrocarbon liquid, Buna N sealing rings are more suitable. For food and pharmaceutical sanitary applications, we can provide food-grade material certificates. We can also customize special micron grades and special end cap structures upon request.

FAQ

Q1: What is the difference between this high flow cartridge and conventional small pleated filter cartridges?

A: It has a 152mm large diameter, much larger filtration area and much higher single-element flow. It needs fewer cartridges, so the filter housing size and maintenance workload are greatly reduced. The flow direction is inside-out instead of the common outside-in.

Q2: Why adopt inside-out flow direction?

A: All impurities are trapped inside the filter medium. Even if the medium gets damaged, the contaminants will not be flushed into downstream pipelines, which is critical for RO membrane protection.

Q3: Can this cartridge work with self-cleaning filter and water filter housing?

A: Yes. This is the most common matching scheme: self-cleaning filter for coarse filtration, high flow filter cartridge inside water filter housing for safety polishing filtration.

Q4: What is the most commonly used precision for RO safety filtration?

A: 5μm is the mainstream selection for RO pre-treatment, which balances dirt holding capacity and membrane protection effect.

Q5: Is this cartridge reusable after cleaning?

A: It is a disposable depth filter element. Once the medium is fully loaded with particles, cleaning cannot restore its filtration performance, so replacement is required.

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