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IMPORTANT: This is not a standalone device; it requires an Independent Doser 2/3 (Maxi) or a ProfiLux 4 Controller to operate.
The GHL Doser 3 Maxi EXT, with an adjustable flow rate of up to approximately 350 ml/min per pump, is ideal for expanding dosing systems, automatic water changes, level control, and high-volume dosing. Thanks to the 24V stepper motors with SilentDrive technology, extremely precise micro-dosing of up to 0.1 ml is possible, ensuring maximum stability of aquarium parameters.
The robust mechanics, combined with advanced motor drivers, allow continuous, silent, and highly reliable operation, even in demanding applications such as reactor operation or automatic water replacement and change systems.
The LED-illuminated GHL logo on the housing acts as a visual status indicator, allowing you to quickly identify the system’s condition.
The GHL Doser 3 Maxi is available as a Standalone Unit (SA) and an Extension Unit (EXT), with the EXT model specifically developed to expand existing systems controlled by an SA unit or a ProfiLux controller.
Key Features of the GHL Doser 3 Maxi EXT
24V Stepper Motors with SilentDrive Technology
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Ultra-quiet operation
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High dosing stability and precision
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Micro-dosing down to 0.1 ml
High Dosing Capacity
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Up to approximately 350 ml/min per pump
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Suitable for large volumes and continuous applications
System Expansion
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Simple connection via PAB (ProfiLux Aquatic Bus)
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Compatible with GHL Doser Stand Alone or ProfiLux
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Expandable up to 16 pumps with SA or up to 32 with ProfiLux
Solution Mixing
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Outputs for GHL magnetic stirrers to ensure homogenization before dosing
Premium Build
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Made in Germany
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Compact and robust design
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Same build quality as the SA model
Ease of Use and Connectivity
When connected to a Standalone unit or ProfiLux, the GHL Doser 3 Maxi EXT can be controlled via:
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GHL Connect app
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myGHL cloud service
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Integrated web interface
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GHL Control Center PC software
Configuration can be done locally or remotely, providing full control over the dosing system.
Advanced Dosing Programming
Doser 3 Maxi-based systems allow:
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Up to 250 micro-doses per day per pump
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Automatic distribution of doses throughout the day
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Up to 24 individually configurable dosing times
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Independent configuration for each pump
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All with a minimum resolution of 0.1 ml for maximum precision
GHL Pump System and Monitoring
GHL Logbook
Allows tracking aquarium events, recording water parameters, setting maintenance reminders, and analyzing trends over time.
Extension Unit (EXT) – Smart Expansion
The GHL Doser 3 Maxi EXT is ideal when additional dosing channels are needed for an existing system.
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Adds 2 high-capacity pumps
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Same performance and quiet operation as the SA model
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Reliable, interference-free communication via PAB
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Full integration with GHL devices
⚠️ Note: The EXT model does not operate independently — it requires a Standalone unit or ProfiLux controller.
Suitable for Continuous Operation
Designed to operate continuously in demanding applications while maintaining long-term precision and reliability.
Extremely Precise Dosing
24V stepper motors with advanced technology ensure stable dosing even at very low volumes (0.1 ml).
Transport and Dosing Capacity
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Up to approximately 350 ml/min per pump
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Fine volume adjustment with millimeter-level precision
Quality and Construction
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High-performance peristaltic pumps
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Chemically resistant tubing
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Robust and durable frame
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Designed for long-term, reliable use
Versatility and Expandability
The GHL Doser 3 Maxi system is highly expandable:
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Up to 16 pumps with Standalone unit + EXT
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Up to 32 pumps with ProfiLux controller + EXT
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Ideal for complex dosing systems and advanced aquarium automation
Technical Specifications
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Dimensions (without pumps): 220 × 150 × 103 mm
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Motors: 24V stepper motors
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Minimum dosing: 0.1 ml
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Maximum capacity: Approximately 350 ml/min per pump