Regarding precision and accuracy, nothing compares to our flagship, the GHL Doser. Hobbyists and Research Facilities have relied on it since 1999.
The GHL Doser 2.2 Maxi with a flow rate of up to 320 ml/minute is ideal for automatic water changes, level control, and dosing in larger quantities. Due to the precise 24 V stepper motors, micro-doses of 0.1 ml are also possible
Robust mechanics and highly efficient stepper motors even allow continuous operation at constant speed, e.g. for operating reactors.
GHL Doser 2.2 Maxi Highlights
Ease of Use and Multiple Connectivity Options
Easy and convenient operation with GHL Connect (app, web interface and cloud service) or GHL Control Center PC software.
Connect via WiFi or USB.
Precision and Flexible Dosing Schedules
Highly accurate 24 V stepper motors allow you to perform up to 150 micro doses per day. Precisely adjustable with a resolution of 0.1mL!
When determining the dosing times, you can choose your doses to be distributed automatically throughout the day — or up to 8 doses per day, individually set.
Tracking with the GHL Logbook
Keep track of all your aquarium-related events, set reminders, record past and current water parameters, and more with the GHL Logbook.
The GHL Logbook is your digital notepad for recording aquarium-related events, setting reminders, recording past and current water test results, and so much more.
„Have accurately set the dispensing at 0.1 ml and I am always impressed again how well it works“
Customer Review GHL Support Forum
Scalable to a Complete Dosing System
Need to control multiple dosing pumps? The GHL Doser 2.2 Maxi is the ideal solution, offering seamless expandability into a full dosing system. When used with a ProfiLux controller, you can independently manage up to 32 pumps—or up to 16 pumps when using any Stand Alone (SA) Doser.
The Stand Alone version includes integrated control electronics, allowing it to manage additional extension units (GHL Doser 2.x Extension or GHL Doser Maxi Extension).
Extension Dosers connect easily to either a Stand Alone Doser (GHL Doser 2.x SA or GHL Doser Maxi SA) or a ProfiLux 3 / 4 Controller.
All dosing pump settings can be configured with ease—locally or remotely—via the GHL Connect app, myGHL cloud platform, integrated web interface, or GHL Control Center.
Did you know that you can use the Stand Alone Doser also as an Extension Doser?
Simply activate the Extension Mode with a single click.
Stand Alone and Extension Doser Ports
GHL Doser 2.2 Maxi Stand Alone
Unlock the Full Potential of the GHL Doser 2.2 Maxi Stand Alone
Enhance functionality by connecting up to two level sensors to monitor the water level in your aquarium or sump, along with a temperature sensor to keep track of water temperature.
For optimal dosing accuracy, pair the system with our Magnetic Stirrer to ensure liquids are thoroughly mixed before each dose.
GHL Doser 2.2 Maxi Extension (EXT)
Expand Your System with Ease
Add additional dosing units to your Stand Alone Doser or control the Extension Doser directly with a ProfiLux Controller.
Communication is interference-free and highly reliable thanks to the GHL PAB (ProfiLux Aquatic Bus) and robust PAB cables.
GHL Doser 2.2 Maxi: Quiet – Efficient – Reliable
Features at a Glance
Refilling and changing of water.
The high-performance 24V stepper motors ensure accurate and reliable dosing, even for very small quantities (as little as 0.1 mL).
- Up to 150 doses per day in automatic mode
- Up to 8 individually programmable dosing times
- Each pump operates independently
- Adjustable dosing speed – up to approx. 320 mL/min
- Effortless setup with a built-in step-by-step guide
- Customizable categories for quick and easy data entry
- Automatic recording of test results from supported devices
- Visualize past and current values with a flexible, customizable chart
- Manually log test results from external test kits
- Record the addition of livestock or other changes in your tank
- Set reminders for important maintenance tasks like probe calibration or filter replacement
The illuminated GHL logo on the housing cover functions as a clear and intuitive status indicator. Different colors provide instant visual feedback on the current state of your system:
- White – Configuration mode
- Blue – Normal operation (no warnings or errors)
- Green – Dosing in progress
- Yellow – Warning: Liquid level below set threshold
- Red – Alarm: Liquid level critically low
Keep track and control of the liquid levels in your containers. An alarm signals that the minimum quantity has been reached.
- Magnetic Stirrers
Standalone model only:
- USB and WiFi
- Prepared for external GHL Control Pad
- Temperature sensors and Level sensors
The GHL Doser 2.2 Maxi offers flexible configuration options to fit a wide range of needs:
- Stand Alone (SA): Equipped with integrated control electronics, for independent operation.
- Extension (EXT): Operated via a GHL Doser 2.x SA, GHL Doser 2.x Maxi SA, or a ProfiLux Aquarium Controller.
Available with either a white or black cover to match your system’s look.
Getting started with the Doser 2.2 Maxi Stand Alone is straightforward. Configuration and daily operation are easily handled via the free GHL Connect app, the myGHL cloud platform, the integrated web interface, or the GHL Control Center (GCC) software for PC.
- The GHL Doser 2.2 Maxi is built from high-quality, long-lasting materials to ensure maximum reliability.
- Each dosing pump features chemical-resistant tubing and stainless steel motor shafts.
- The housing is made of rugged aluminum combined with durable plastic, providing solid protection and long service life.
Dimensions (without pumps): 220 x 150 x 103 mm (8.66″ x 5.91″ x 4″)
Quality and Functionality. The cutting-edge GHL PP2 Peristaltic Pump.
The PP2 peristaltic pump was developed from scratch by GHL and offers outstanding performance in addition to a modern and sleek design.
Easy maintenance without tools: After moving the pump cover, all internal parts are easily accessible.
The push-buttons on the front panel allow for quick manual dosing or priming the tubes.
Push-pull fittings allow the use of semi-rigid tubes (OD = 6 mm); flexible tubes can also be used with the supplied adapters.
Maintenance & wear parts
Regular maintenance ensures long-term performance
Although the pumps are largely maintenance-free, we recommend occasional cleaning of the internal components to remove dust and buildup. To ensure smooth operation and reduce wear, the pump must always be lubricated. A silicone-based lubricant is preferred; Vaseline may be used if necessary.
Tubes, pump heads, and motors are wear parts
Their service life depends on usage frequency, dosing volume, and environmental conditions.
Typical lifespans: approx. 5000 hours for the motor, approx. 800 hours for the pump head.
If you notice issues such as reduced flow, loss of prime, leakage, increased noise, or visible mechanical damage, the affected part should be replaced.
Thanks to the maintenance-friendly design, all wear parts can be easily accessed and replaced. Replacement parts are available as accessories.