GHL Doser 2.1

GHL Doser 2.2 Standalone, 4 Pumps


This item ships directly from the manufacturer/supplier.

Stand Alone dosing pump unit with integrated controller, 4 Pumps, WLAN, USB, stepper motors and power supply, USB cable, 4x tube adapters.

The GHL Doser 2.2 Standalone has a flow rate of up to 45 ml/minute which make 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. The Doser 2.2 SA provides the flexibility to daisy chain multiple GHL Dosing Units (EXT models: Doser 2.x / 2.x Maxi) to control up to 16 dosing pumps in total. The ProfiLux Aquatic Bus provides reliable and interference-free data transfer, even over long distances up to 100 m (300 ft.).

Dimensions: 8.66″ x 5.91″ x 3″ (without pumps)

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


Black, White


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. 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 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)
  • 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
  • Wi-Fi 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
  • Power supply
  • 4x Tubing adapters
  • 6ft USB cable

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 life time 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.

Why Buy From ReefBum?

Number one, I have been a hobbyist for over 25 years who wrote a book on reef keeping best practices……so I can leverage this wisdom to provide expert advise on equipment purchases.

Secondly, I am the sole proprietor and employee of this company who can be contacted any day of the week to answer your questions about equipment sold on Therefore, you will always deal with the same person who actually uses the equipment you buy. And if I don’t have an immediate answer I can reach out to the manufacturer to get an answer….I have direct communication pipelines with all of them.

Yes, I am a “mom & pop” shop that will not always beat pricing from the “big box” online reef stores. But think of me as your personal reef tank concierge who is always on call to help figure out a problem or just chat about reef tanks. Now that’s priceless!

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