At AquaCave, we offer some of the best selection and best prices on GHL ProfiLux Aquarium Dosing Pumps, Wi-Fi Dosers, Reef Dosing Pumps for your marine, reef, and freshwater aquarium. Simplify your dosing - The GHL Doser 2 affords simple and accurate dosing of liquids such as micro elements, fertilizer and balling salts. The GHL Doser 2 is available in a 2 to 4 pump configuration and in two colors: black and white. You will have the expansion capabilities to control up to 16 pumps. By the use of a modular system, the slave unit can be connected with a ProfiLux controller or with a GHL Doser 2 standalone.