70 Inch High Flow Water Filter Cartridge for RO Pre-Filtration and Seawater Desalination

Pullner 70-inch high flow filter cartridge features a large-diameter PP pleated structure, high flow capacity, low pressure drop, and adhesive-free thermal welding for seawater desalination, RO pre-filtration, power plants, and industrial water treatment.

The 70 inch high flow filter cartridge is designed for high-flow water filtration applications such as seawater desalination, reverse osmosis RO pre-filtration and industrial water treatment. Its large filtration area and high dirt-holding capacity allow a single cartridge to handle a much higher flow rate than conventional small-diameter filter cartridges, helping reduce the number of cartridges and filter housing size required for large water treatment systems.

The cartridge uses a thermally welded construction without adhesives, providing a stable structure and reducing the risk of additional contamination during water filtration. The pleated filtration design offers a large effective filtration area, low initial pressure drop and longer service life, making it suitable for continuous operation in high-flow systems.

In seawater desalination plants, this high flow filter cartridge is commonly installed before the RO membrane system. Its main purpose is to remove suspended solids, sand, rust, pipe scale and other particles from the feed water before they reach the RO membranes.

By reducing the particle load entering the RO system, the cartridge helps protect RO membranes from premature fouling and blockage, reduce membrane cleaning frequency and improve the stability of the entire desalination process.

It can also be used as a pre-filter before finer cartridge filtration, ultrafiltration or other membrane treatment equipment.

Typical applications include seawater desalination RO pre-filtration, brackish water treatment, municipal water treatment, power plant water systems, industrial process water, cooling water filtration and large-flow water purification systems.

For large desalination and industrial water projects, the 70 inch design is especially suitable where high flow capacity, lower pressure drop and reduced cartridge replacement frequency are

The actual flow rate and service life depend on the filtration medium, contaminant concentration, operating pressure, viscosity, temperature, and required filtration accuracy.

Pullner can customize the 70-inch high flow filter cartridge according to the customer's existing filter housing and operating conditions.

• Filtration accuracy
• Filter media
• Outside diameter
• End cap structure
• Seal material
• Cartridge length
• Pleat configuration
• Filtration area
• Connection dimensions
• Replacement compatibility

For replacement projects, customers may provide the original cartridge model, technical drawing, product photos, operating conditions, or a physical sample. Pullner's technical team can verify dimensions and recommend a suitable replacement solution.

Pullner applies quality control throughout raw material inspection, production, assembly, testing, and final packaging.

• Dimensional inspection
• Flow rate testing
• Initial pressure-drop testing
• Bubble-point testing
• Integrity testing
• Air permeability testing
• Seal and connection inspection
• Material verification
• Appearance inspection

Pullner operates under ISO 9001, ISO 14001, and ISO 45001 management systems. Product inspection documents and relevant test reports can be provided according to project requirements.

Pullner provides practical technical support for industrial filtration projects, including:

• Filter cartridge selection
• Micron rating recommendation
• Filter media compatibility analysis
• Existing housing compatibility confirmation
• Flow rate and pressure-drop evaluation
• Sample production and testing
• Replacement cartridge development
• Installation and maintenance guidance
• Filtration system optimization

Lead time may vary depending on filtration media, end cap structure, seal material, testing requirements, and order quantity.

It is mainly used in large-capacity liquid filtration systems, including seawater desalination, RO pre-filtration, power plants, industrial water treatment, cooling water, and petrochemical process water.

The standard outside diameter is approximately 6 inches or 6.5 inches. The large-diameter structure provides a bigger filtration area and higher flow capacity than conventional filter cartridges.

The extended cartridge length provides a larger filtration area and allows fewer cartridges to handle the required system flow. This can reduce housing size, replacement frequency, installation space, and maintenance work.

The standard flow direction is inside to outside. Contaminants are captured within the pleated media while filtered liquid flows toward the outside of the cartridge.

No. The cartridge components are thermally welded without adhesives or binders, providing a clean and stable construction.

Yes. Pullner can customize the end cap, seal, outside diameter, length, and connection structure according to the customer's existing housing. Drawings, photos, original models, or samples can be used for dimensional confirmation.

Pullner can develop replacement cartridges for many common large-diameter filtration systems. Final compatibility must be confirmed according to the cartridge dimensions, sealing structure, operating conditions, and filter housing design.

Polypropylene is commonly selected because of its good chemical resistance, clean construction, and suitability for water and seawater pre-filtration. The final material should be confirmed according to temperature, chemicals, pressure, and required filtration accuracy.

Each 70-inch high flow filter cartridge is sealed in a protective poly bag and packed in a reinforced export carton. Wooden cases or pallets can be provided for large orders or long-distance transportation.

Before shipment, the cartridge model, dimensions, quantity, packaging condition, and required documents are checked to reduce the risk of transportation damage or delivery errors.

Shanghai Pullner Filtration Technology Co., Ltd. was established in 2011 and specializes in the development and manufacturing of industrial filter cartridges, filter housings, and customized filtration solutions.

Pullner products are widely used in seawater desalination, industrial water treatment, power generation, fine chemicals, new energy, semiconductor manufacturing, phar.maceuticals, food and beverage, and other industrial applications.

The company operates a 3,000 m² Class 100,000 clean production workshop and an internal Class 1,000 clean laboratory. Pullner is certified according to ISO 9001, ISO 14001, and ISO 45001 management systems and holds multiple filtration-related patents.

As a qualified supplier to Saudi Aramco and other industrial customers, Pullner focuses on reliable product quality, flexible customization, small-batch testing, and practical technical support.