GHL Doser 2.2 EXT


Extension dosing pump unit without control, 4 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 EXT has a flow rate of up to 45 ml/minute which makes it ideal for standard dosing quantities and small volume ATO / AWC (less than 1.5 gallons daily recommended).

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 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 Wi-Fi 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 3″ (without pumps)

Additional information

Product color

Black, White

About GHL Doser 2.2

Thanks to the high-quality technology inside the compact and modern GHL Doser 2.2, 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 Wi-Fi 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 is available as a Stand Alone Unit and an Extension Unit.

GHL Doser 2.2 Stand Alone:

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

It includes two PAB ports for connecting additional GHL Doser 2.2 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 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 2.2 EXT:

The GHL Doser 2.2 EXT needs to be controlled via a ProfiLux Controller or a GHL Doser 2.2 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)
  • Automatic Water Change

  • 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
  • Pumps can be retrofitted
  • Individual parts can be replaced (tubes, pump head, motor)
  • 24V stepper motors allow micro doses 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
  • Wide-range dose control
    Continuous mode: Min. 0.1 ml / minute, Max. 20 ml / minute,
    Standard mode: Min.  0.1ml / minute, Max. 45 ml / minute
  • 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 EXT
  • 24V power supply
  • 4x Tubing adapters

Maintenance & Wear parts

Doser 2.2 pumps are largely maintenance-free. For optimal performance, we recommend occasionally cleaning and removing dust and other impurities from the inside of the pumps. The pumps must never be lubricated in any way!

Tubes, pumps and motors are wear parts, the lifetime depends on the use frequency, flow quantity and environmental conditions. When malfunctions (e.g., insufficient flow, losing prime, leakage, increased operation noise) or mechanical damages occur the wear parts must be replaced. Due to the maintenance-friendly design all wear parts can be replaced easily, all wear parts are available as accessories.

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



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