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.

The LED illuminated GHL Logo in the housing serves as a status indicator. Various colors and blink codes and tell you when something requires your attention.

The GHL Doser 2.2 Maxi is available as a Stand-Alone Unit (SA) and Extension Unit (EXT).

  1. GHL-Doser-2_2_Maxi_FrontRight_black_1400x952
  2. GHL Doser 2.2 Maxi, white

available in black or white

GHL Doser 2.2 Maxi Highlights

24V Stepper Motors

Dosing & Refilling


Continous Dosing

Dosing Schedule

Automatic Waterchange

Ease of Use and Multiple Connectivity Options

GHL Connect App

my GHL Cloud Service


Push Notifications



Easy and convenient operation with GHL Connect (app, web interface and cloud service) or GHL Control Center PC software.

Connect via WiFi or USB.

PC-Software & Apps by GHL
Precision and Flexible Dosing Schedules

Accurate 24 V stepper motors allow you to perform up to 150 doses per day.

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.

Expandable to a Dosing System

Do you need more than one device? If so, the GHL Doser Maxi 2.2 is perfect for you because the Doser can be expanded into an efficient dosing system. Control up to 32 pumps independently with a ProfiLux or 16 pumps with any SA Doser.


The Stand Alone unit has integrated control. With it, you can additionally control other Extension Dosers (GHL Doser 2/ 2.1/ 2.2 Extension or GHL Doser Maxi Extension) units.

The Extension Doser has an interface for control via the Stand Alone Doser (GHL Doser 2/ 2.1/ 2.2 SA or GHL Doser Maxi SA) or the ProfiLux Controller.

The settings for all the pumps can be adjusted easily and clearly via the GHL Connect app, myGHL cloud, integrated web server, or GHL Control Center. Even when you are not at home.

Flexible and Future Proof

Did you know that you can use the Stand Alone Doser also as an Extension Doser, e.g. when you decide later to use your doser with an aquarium controller ProfiLux 4?

Simply activate the Doser Extension Mode with a single click.

Stand Alone and Extension Doser Ports

GHL Doser 2.2 Maxi Stand Alone

Realize the full potential of GHL Doser Maxi 2.2 Stand Alone:

The Stand Alone unit has integrated control. With it, you can additionally control other Extension Dosers (GHL Doser 2/ 2.1/ 2.2 Extension or GHL Doser Maxi Extension).

You can also connect up to 2 Level sensors to monitor the water level in your basin and a temperature sensor for checking the water temperature. You can even use our Magnetic Stirrer to ensure that fluids are always mixed prior to dosing.

GHL Doser 2.2 Maxi Extension

You can expand your Stand Alone Doser with an Extension Doser or connect a ProfiLux 4 for control.

The interference-free connection is made with PAB cables using the PAB-Port.

GHL Doser 2.2 Maxi: Quiet – Efficient – Reliable

Features at a Glance

Connect up to 2 external magnetic stirring units, the GHL Control Pad * or Temperature and Level Sensors.

* Not yet available

Refilling and changing water.

The pumps are suited for continuous operation, please see also Maintenance & wear parts below.

The 24V stepper motors allow precise dosing even at the smallest flow rates (0.1 ml).

  • Up to 150 doses per day
  • Easily chose dosing times via software (GHL Control Center).
    Automatically: Up to 150 individual doses per day automatically distributed
    Individually: Up to 8 doses per day individually set
  • Each pump can be set separately
  • Conveying capacity and dosing:
    up to 320 ml / minute (precisely adjustable to 0.1 ml)

The LEDbacklit GHL Logo in the housing cover serves as a status indicator. Various colors show you at a glance, the condition of your system.

  • White = Configuration mode
  • Blue = Normal
  • Green = Amount of liquid in the container is OK
  • Yellow = Warning threshold amount of liquid undershot
  • Red = Alarm threshold amount of liquid undershot

Learn more

Keep track and control of the liquid levels in your containers. An alarm signals that the minimum quantity has been reached.

  • Magnetic Stirrers
  • External GHL Control Pad (4,3” Touch screen)
  • Temperature sensors and Level sensors

Programming and operating the GHL Doser 2.2 Maxi Stand Alone is easily accessible via the free PC software GCC, app and cloud service myGHL.

The connection can be made via WiFi or USB.

  • 2 precise pumps with heavy-duty stepper motors
  • Chemical-resistant tubing
  • Sturdy construction, housing is made of aluminum and durable plastic.

GHL Doser 2.2 Maxi is available in two different models:

  • Stand Alone (SA): With integrated control
  • Extension (EXT): Without control, controllable via GHL Doser 2/ 2.2 Maxi SA, GHL Doser 2/ 2.1/ 2.2 SA, ProfiLux Aquarium Controller

In addition, select between white and black (cover).

Do you need more pumps? No problem: The system is expandable to a total of 32 pumps.

  • 16 pumps with Stand Alone + one or more EXT Doser (GHL Doser 2/ 2.1/ 2.2 EXT or GHL Doser Maxi 2.1/ 2.2 EXT)
  • 32 pumps with ProfiLux Controller + one or more Extension Doser (GHL Doser 2/ 2.1/ 2.2 EXT or GHL Doser Maxi 2.1/ 2.2 EXT)

The ProfiLux Aquatic Bus provides reliable and interference-free data transfer, even over long distances up to 100 m (300 ft.).

Dimensions (without pumps): 220 x 150 x 103 mm (8.66″ x 5.91″ x 4″)

Dosing Volume: Min. 0.5 ml / minute, Max. Continuous 160 ml / minute, Max. Volumetric 320 ml / minute

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

The pumps are largely maintenance-free. For optimal performance, we recommend occasionally cleaning and removing dust and other impurities from the inside of the pumps. In order to reduce noise during operation it is allowed to lubricate the pump with vaseline.

Tubes, pumps and motors are wear parts, the life time depends on the use frequency, flow quantity and environmental conditions.

Average lifetime: 5000 hours for the motor, 800 hours for the pump head.
When malfunctions (e.g. insufficient flow, losing prime, leakage, increased operation noise) or mechanical damages occur the pump head or motor must be replaced. Due to the maintenance-friendly design wear parts can be replaced easily, wear parts are available as accessories.