See more about this article : Calcium dispenser Unit

The addition of lime water is another method to increase the calcium in saltwater aquariums. The calcium hydroxide is dissolved in a separate tank by means of the water jet of the metering pump in the osmotic regulator(s). The lime water is then released into the aquarium in small quantities in regular intervals. The calcium dispenser is fitted between the metering pump and the infeed hose. All TUNZE® Osmolator, Osmomat and osmotic regulator sets can be used. The calcium dispenser can also be installed in every water storage tank. The dispenser tank should be topped up with calcium hydroxide every one to two weeks.
The calcium dispenser and the calcium reactor can be combined well with each other. An especially well set pH stability is achieved during the day as well as at night. An increase in performance can be achieved for a larger consumption.
Delivery condition: Reactor, calcium hydroxide fill, holding device and connections to Osmolator, suitable for aquariums inhabited with stone corals and a volume of up to approx. 500 l (132 US gal.).
Dimensions: 350 x 140 mm (13.7 x 5.5 in.).