70 Inch High Flow Filter Cartridge for Seawater Desalination and RO Pre-Filtration
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.
Product Overview
Pullner 70 Inch High Flow Filter Cartridge is designed for large-capacity water filtration systems where high flow rate, low pressure drop, and long service life are required.
The cartridge features a large 6-inch or 6.5-inch diameter, single open-end structure, pleated filter media, and inside-to-outside flow direction. Its coreless design reduces unnecessary material use and makes cartridge replacement more convenient.
All cartridge components are connected by thermal welding without adhesives or binders. This clean construction helps reduce the risk of extractables and ensures stable filtration performance in demanding industrial applications.
With an extended 70-inch length and large effective filtration area, one cartridge can handle a significantly higher flow rate than conventional 10-inch or 40-inch filter cartridges. It is particularly suitable for seawater desalination and large RO pre-filtration systems, helping remove suspended solids and protect downstream RO membranes.
Main Advantages
- Large 70-inch structure for high-capacity filtration systems
- Approximately 9.1 m² filtration area, depending on media and pleat design
- High flow capacity with reduced pressure drop
- Inside-to-outside flow direction for effective contaminant retention
- Single open-end and coreless construction
- Thermally welded without adhesives
- Available in polypropylene, glass fiber, and organic fiber media
- Wide micron range from 0.1 μm to 100 μm
- Reduced cartridge quantity and smaller housing footprint
- Suitable for new filtration systems and replacement projects
Technical Specifications
| Specification |
Details |
| Product Length |
70 inches |
| Outside Diameter |
6 inches or 6.5 inches |
| Filtration Area |
Approximately 9.1 m² |
| Micron Rating |
0.1 μm to 100 μm |
| Filter Media |
Polypropylene, glass fiber, or organic fiber |
| Support Material |
Polypropylene |
| Flow Direction |
Inside to outside |
| Connection Structure |
Single open end |
| Internal Structure |
Coreless design |
| Welding Method |
Thermal welding without adhesives |
| Seal Materials |
EPDM, NBR, Silicone, Viton/FKM |
| End Cap Options |
Customized according to filter housing |
| Operating Conditions |
Confirmed according to media, temperature, pressure, and flow rate |
The actual flow rate and service life depend on the filtration medium, contaminant concentration, operating pressure, viscosity, temperature, and required filtration accuracy.
Typical Applications
- Seawater desalination pre-filtration
- Reverse osmosis membrane protection
- Industrial water treatment
- Power plant condensate and makeup water filtration
- Petrochemical process water filtration
- Cooling water filtration
- Reclaimed water treatment
- Food and beverage process water
- Fine chemical filtration
- Large-flow liquid filtration systems
In seawater desalination systems, the cartridge can be installed before RO membranes to remove suspended particles, rust, sand, and other contaminants. This helps reduce membrane fouling, extend membrane service life, and improve the stability of the desalination system.
Customized Filtration Solutions
Pullner can customize the 70-inch high flow filter cartridge according to the customer's existing filter housing and operating conditions.
Customization Options
- 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.
Quality Control and Testing
Pullner applies quality control throughout raw material inspection, production, assembly, testing, and final packaging.
Available Inspection and Testing Capabilities
- 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.
Technical Support
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
Customers are encouraged to provide detailed operating information, such as filtration medium, temperature, pressure, flow rate, contaminant type, existing housing dimensions, and required filtration efficiency. This allows Pullner to recommend a more reliable cartridge configuration.
Ordering Information
| Item |
Details |
| Minimum Order Quantity |
1 piece |
| Standard Length |
70 inches |
| Supply Capacity |
Up to 100 pieces per day |
| Standard Lead Time |
Approximately 9 working days after technical confirmation |
| Packaging |
Individual poly bag with reinforced export carton |
| Bulk Packaging |
Wooden case or pallet available when required |
| Payment Terms |
T/T or L/C |
| Sample Order |
Available |
Lead time may vary depending on filtration media, end cap structure, seal material, testing requirements, and order quantity.
Frequently Asked Questions
What is a 70-inch high flow filter cartridge used for?
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.
What is the diameter of the cartridge?
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.
Why choose a 70-inch cartridge?
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.
What is the flow direction?
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.
Is adhesive used in the cartridge?
No. The cartridge components are thermally welded without adhesives or binders, providing a clean and stable construction.
Can the cartridge be customized for an existing housing?
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.
Can it replace an existing high flow cartridge?
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.
Which filter material is recommended for seawater filtration?
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.
Packaging and Shipping
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.
About Pullner Filtration
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.
For 70-inch high flow filter cartridge selection, replacement development, or seawater filtration projects, please contact Pullner with your operating conditions and filter housing information.
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