GHL Doser 2.2 Maxi EXT


Extension dosing pump unit without control, 2 pumps, stepper motors, power supply, and tube adapters.

Not a standalone product; requires GHL Doser Standalone or ProfiLux (3 and higher) to operate this device.

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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 a constant speed, e.g., for operating reactors.


Not a stand-alone device.

The GHL Doser 2.2 Maxi EXT needs to be controlled via a ProfiLux Controller or a GHL Doser 2.x (Maxi/Standard) Stand Alone.

Its 24 V stepper motors allow precise dosing. The connection can be made via WiFi or USB.

The system is expandable to a total of 16 pumps. The ProfiLux Aquatic Bus provides reliable and interference-free data transfer, even over long distances up to 100 m (300 ft.).

Technical specifications:

Color: Black or white
Dimensions: 8.66″ x 5.91″ x 4″ (without pumps)

Completing the initial setup of a GHL device takes no more than 5 minutes with our in-app wizard!

Click image to view video.

Additional information

Weight 1.50 kg
Product color

Black, White

About GHL Doser 2.2 Maxi

Thanks to the high-quality technology inside the compact and modern GHL Doser 2.2 Maxi, it provides precise and straightforward dosing and includes many more features. With the free GHL Connect App or the cloud service myGHL, you can access your Doser from anywhere in the world to start dispensing programs or check the levels of your metering liquids.
Its 24V stepper motors allow precise dosing even at the smallest flow rates (0.1 mL). Operate the device comfortably from your smartphone or your PC. The connection is possible via WiFi and USB.

The LED-illuminated GHL Logo in the housing serves as a status indicator. It displays the condition of your aquarium by displaying various colors and tells you when something requires your attention.

The GHL Doser 2.2 Maxi is available as a Stand Alone Unit and an Extention Unit.

GHL Doser 2.2 Maxi Stand Alone:

The GHL Doser 2.2 Maxi Stand Alone has a controller and works independently.

It includes two PAB ports for connecting additional GHL Doser 2.2 Maxi EXT or other PAB devices via ProfiLux Aquatic Bus.

PAB is an interference-free CAN-Bus-System that allows for highly secure data transfer between all PAB devices. The range can be up to 100 m (300 FT).

  • PAB cables are not included and must be purchased.

One GHL Doser 2.2 Maxi SA can control additional GHL EXT Dosers (GHL Doser 2.2 EXT or GHL Doser 2.2 Maxi EXT) and can be extended to a dosing system with a total of 16 pumps.

With a ProfiLux as a controller, you can control up to 32 pumps.

GHL Doser Maxi 2.2 EXT:

The GHL Doser 2.2 Maxi EXT needs to be controlled via a ProfiLux Controller or a GHL Doser 2.2 Maxi Stand Alone.


Milliliter precision and automated dispensing of liquids, such as

  • Fertilizers
  • Trace Elements
  • Balling Salts
  • Lime Water
  • Liquid Feed
  • Integrated evaporated water refill (Auto Top–Off)
  • Water exchange

  • Expandable to 16 pumps respectively, metering channels
  • Precise pumps with heavy-duty stepper motors
  • The pumps are suited for continuous operation
  • Stainless steel motor shafts (also suitable for the dosage of Iodine)
  • Sturdy construction, housing is made of aluminum and durable plastic
  • Chemical-resistant tubing
  • Manual operation of each pump is possible
  • The pumps are suited for continuous operation
  • Pumps can be retrofitted
  • Individual parts can be replaced (tubes, pump head, motor)
  • 24V stepper motors allow microdoses of 0.1 mL

  • Up to 150 doses per day
  • Easily choose dosing times via GHL Connect App and software (GHL Control Center).
    Automatically: Up to 150 individual doses per day are automatically distributed
    Individually: Up to 8 doses per day, individually set
  • Each pump can be set separately
  • Conveying capacity and dosing:
    Min. 0.5 ml / minute, Max. Continuous 160 ml / minute, Max. Volumetric 320 ml / minute
  •  precisely adjustable to 0.1 mL
  • Level indicator

  • WiFi and USB
  • Alarm function
  • Large LED status indicator
  • Status LED for pumps

  • Convenient to program via APP, cloud, web server, and free PC software

The LED-backlit GHL Logo in the enclosure lid is a status indicator. Various colors show you, at a glance, the condition of your system.

Each pump can be operated manually via the push buttons on the front panel. This allows you to quickly post-dose, deflate the tube vent, or suction liquids.

Ample accessories are available.

Delivery includes

  • GHL Doser 2.2 Maxi
  • Power supply
  • 4x Tubing adapters



GHL provides a 24-month limited warranty against all processing and material defects. Warranty period begins at the date of purchase.

We recommend you to read these articles in our Knowledge Base to learn more about this product: