Product description
Colour-change deionising resin cartridge for ultra-pure water control
The Deionising Colour-Change Resin Filter Cartridge is designed to polish pre-treated water to high purity levels while providing a clear visual indication of resin exhaustion. As the resin capacity is consumed, the colour of the media changes, allowing easy monitoring of cartridge life without the need for conductivity meters.
These cartridges are commonly used as a standalone solution for small batch production of pure water or as a final polishing and performance indicator stage after larger deionisation or reverse osmosis systems.
Filtration principle
The colour-change deionising cartridge operates using mixed bed ion exchange technology. Dissolved cations are exchanged for hydrogen ions and dissolved anions are exchanged for hydroxide ions. These combine to form pure water.
A colour-change indicator integrated into the resin provides a visual signal as the ion exchange capacity becomes exhausted.
This process delivers:
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effective removal of dissolved ions
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consistent polishing of pre-treated water
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visual indication of resin exhaustion
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simplified maintenance and replacement planning
Filter media
The cartridge contains a mixed bed, colour-change ion exchange resin consisting of:
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60 percent strong acid cation resin in hydrogen form
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40 percent strong base anion resin in hydroxide form
The resin transitions from blue to brown as exhaustion occurs, providing a clear visual indication of remaining capacity.
Performance characteristics
Typical performance characteristics include:
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production of water with conductivity around 0.1 µS/cm under suitable conditions
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stable polishing performance when used after reverse osmosis
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visible indication of resin exhaustion for reliable cartridge replacement
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.
Cartridge configurations
Deionising colour-change 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 versions provide increased resin volume and extended service life.
Typical applications
Deionising colour-change resin cartridges are commonly used in:
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laboratory water systems
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pharmaceutical water preparation
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dental water treatment
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autoclave feed water
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post reverse osmosis polishing
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small batch ultra-pure water production
They are particularly useful where simple visual monitoring is preferred.
Key benefits
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Visual colour-change indication of resin exhaustion
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Produces high purity water
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Ideal as final polishing stage
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Simplifies maintenance planning
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Available in multiple cartridge sizes
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No chemical dosing required
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Easy cartridge replacement
Installation considerations
For optimal performance, colour-change deionising 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
Proper pretreatment significantly extends resin life.
Configuration and quotation
Deionising colour-change resin cartridges are supplied based on cartridge length and diameter. Selection depends on:
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inlet water conductivity
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desired water purity
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required treated water volume
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system flow rate
Filtra International provides technical support to ensure correct cartridge selection and system configuration.