Product description
Deionising resin cartridge for ultra-high purity water polishing
The Deionising Resin Filter Cartridge is designed to polish pre-treated water to ultra-high purity levels by removing remaining dissolved ions. These cartridges are typically installed after reverse osmosis systems to achieve very low conductivity water for demanding technical and laboratory applications.
By using mixed bed ion exchange resins, the cartridge produces consistently high water purity and is suitable for applications where precise water quality is essential.
Filtration principle
The deionising resin cartridge operates using mixed bed ion exchange technology. As water passes through the cartridge, positively charged ions are exchanged for hydrogen ions and negatively charged ions are exchanged for hydroxide ions. These then combine to form pure water.
This process provides:
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effective removal of remaining dissolved salts
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ultra-low conductivity water
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consistent polishing of pre-treated water
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stable performance for high purity applications
The cartridge continues to operate until the resin exchange capacity is exhausted.
Filter media
The cartridge is filled with a nuclear-grade mixed bed resin consisting of:
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50 percent strong acid cation resin in hydrogen form
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50 percent strong base anion resin in hydroxide form
This balanced resin composition allows efficient removal of both cations and anions, resulting in very high water purity.
Performance characteristics
Typical performance characteristics include:
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production of water with conductivity down to approximately 0.055 µS/cm under suitable conditions
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ability to achieve water resistivity up to 18.3 MΩ
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stable performance when used as a polishing stage after reverse osmosis
Actual treated water volume depends on inlet water quality and cartridge size.
Operating conditions
Typical operating parameters include:
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operating temperature range from 4 to 45 °C
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maximum operating pressure of 5.5 bar
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maximum pressure differential of 1.0 bar at 21 °C
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suitable for cold water applications
The cartridge is intended for use with low TDS feed water, typically after reverse osmosis.
Cartridge configurations
Deionising resin cartridges are available in the following configurations:
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cartridge lengths: 5 inch, 10 inch and 20 inch
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diameter options: standard diameter and large diameter (Big Blue)
Large diameter cartridges provide increased resin volume and extended service life.
Typical applications
Deionising resin cartridges are commonly used in:
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laboratory water systems
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pharmaceutical water preparation
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autoclave feed water
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batch ultra-pure water processes
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final polishing after reverse osmosis
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technical and analytical applications
They are ideal where very low conductivity water is required.
Key benefits
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Produces ultra-high purity water
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Effective polishing after reverse osmosis
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Nuclear-grade mixed bed resin
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Compact cartridge format
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Available in multiple lengths and diameters
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Simple cartridge replacement
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No chemical dosing required
Installation considerations
For optimal performance, deionising resin cartridges should be installed:
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after sediment, carbon and reverse osmosis treatment
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in a housing compatible with the selected cartridge diameter
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at controlled flow rates to ensure sufficient contact time
Pretreatment is essential to maximise resin life and performance.
Configuration and quotation
Deionising resin cartridges are supplied based on cartridge length and diameter. Selection depends on:
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inlet water conductivity
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required water purity
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desired treated water volume
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system flow rate
Filtra International provides technical support to ensure correct cartridge selection and system configuration.