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GHL KH Director® White

GHL KH Director® and GHL Doser SA, 2.1 Slave Pump Combination White


Brand: GHL International
Product Code: GHL KH Director and GHL Doser SA, 4 Pump White
Availability: In Stock
$849.00 $999.00
$8.49 back via Rewards Points
Price in reward points: 84900

The GHL KH Director® is a precision dosing solution to monitor and dose KH automatically to exact levels 24/7! GHL has been supplying innovative hi-quality dosing pumps for years in Germany and around the world.

Thanks to the high quality technology inside the compact and modern GHL Doser 2.1, it not only provides precise and simple dosing, but it also includes many more features. With the free GHL Control 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.



The device is comfortably operated from your smartphone or your PC. The connection is possible via WiFi, LAN 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 2.1 is a Stand Alone 4 Pump Slave Unit, a perfect match for the KH Director.

Features and Benefits Include:

  • Advanced Connectivity
  • Integrated Refill (Auto Top-Off)
  • Very Precise Dosing
  • LED Status Display
  • Level Indication and Alarm
  • Versatile Connectivity Options
  • Easy Handling
  • Simple Connection
  • Convincing Quality
  • Model Diversity
  • Expandable to a Whole Dosing System
  • Technical Specifications
  • KHD pH Electrode Included
  • Reagents and Calibration Fluids Included
  • Silicon Tubing Included
  • Inter-Connect Cables Include

How does the KH Director® work?

The KH Director® is designed to work in conjunction with a GHL Doser 2 (2.1) Standalone or a ProfiLux® Aquarium Controller 3 or 4 with a Doser 2 Slave for operation. 

The 2 inlets and 1 outlet of the KH Director connect to 3 dosing pumps on the Doser 2 (2.1). These 3 pumps are then responsible for accurately transferring fluid to and from the KH Director.

A sample of the aquarium water is first sent to the KH Director®. Subsequently, the KH value is determined precisely with slow addition of a further liquid (reagent) and measurement of the pH value.

The sample water is then pumped out again and collected in a separate container for later disposal.

What are the costs for reagent and pH electrode?

Here at GHL we understand the importance of on-going costs involved with automated KH monitoring and control. For the KH Director it was especially important to consider these costs and develop a highly-efficient, cost-effective product. A single 1000ml bottle of reagent can last for up to 3 months when testing is performed 4x per day at a KH value of 8. The pH electrode used by the KH Director was specially designed for KH measurement and has an average lifespan of 1 – 2 years.

Controlling the KH value

KH Director® offers the most comprehensive methods and most adjustment options for the control of the KH value, and is thus suitable for different systems, eg. Balling® (Light), Triton® or kalk reactor. 

Depending on the difference between the target value and the current value of KH (= control difference), appropriate activities for increasing the KH value are started. 

Choose the optimal mode for your aquarium and customize it individually. 

The following modes are offered:

Add-on control mode

Use between 1 and 5 dosing pumps to add liquids to the aquarium depending on the control difference, KHD automatically calculates the appropriate quantities. The dosages can be time-delayed if the liquids are not to be dosed at the same time and divided into several sub-quantities per day. It is also possible that the dosing pumps used follow a dosing schedule, the quantities calculated by the KHD are then added to this dosing schedule. 

Adaptive control mode

In this mode, 1 to 5 dosing pumps can also be used to add liquids to the aquarium depending on the control difference. In this mode, you set a dosing schedule for the dosing pumps involved, and the quantities of the dosing plan are varied by the KHD. If the KH value is correct, the dosing schedule remains unchanged, if the KH value is too low, all quantities of the dosing plan are increased as a percentage. If the KH value is too high, the quantities are reduced. The quantity change is dependent on the control difference and is calculated automatically. 

Calcium reactor control mode

In this mode, a calcium reactor can be down-regulated depending on the KH value.

A calcium reactor is usually operated by CO2 addition and control of the pH value; the actual pH value in the calcium reactor is measured by a pH electrode. If you select this pH electrode in the KH Director Options, the KHD can switch off CO2 if necessary (KH target value reached), otherwise the normal CO2 control is activated. This mode is only possible with a ProfiLux aquarium computer.

Configuration options

The KH Director® can be operated in two ways: A Slave or Control Unit

The KH Director® is connected to the GHL Doser 2 (2.1) Standalone via the ProfiLux Aquatic Bus (PAB).

GHL Doser 2.1+KH Director

With this option, the GHL Doser has full control over the measurement process and behavior of the KH Director. The GHL Doser will control both its dosing pumps and the valves in the KH Director. This will allow the doser to evaluate the measurement results and calculate the KH value.