Aqua Medic 4025901106664 Betriebshandbuch - Seite 6

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Fig. 2: Calciumreactor KR 5000

2. Theory

The equilibrium between calcium and carbonic acid in a seawater aquarium is destroyed due to the biological

activity of the animals. For the construction of their calcareous skeletons, they take calciumcarbonate out of the

water. As a result, it comes to a lack of calcium and an increase of the pH value. The Aqua Medic Calciumreactor

KR 5000 is a module for the adjustment of the natural equilibrium between calcium and carbonic acid in the

aquarium. It is filled with Hydrocarbonate, a highly purified calciumcarbonate. Because this calciumcarbonate is

not soluble at pH values common in seawater tanks, it is necessary to blow carbonic acid into the reactor. This

results in a local drop of the pH value and simultaneously to the dissolving of calciumbicarbonate.

To avoid an overdosage, the addition of carbonic acid can be controlled by use of a pH controller or pH computer.

This method does not change the pH value of the aquarium water.

Chemical reaction:

CaCO

+ CO

O -----> Ca(HCO

)

2 +

Calciumcarbonate + Carbonic acid + Water ------> Calciumbicarbonate

Calciumbicarbonate is easily soluble. It can be directly taken up by animals and plants and integrated into their

skeletons. By doing this, calciumbicarbonate is changed back to calciumcarbonate. During this back reaction,

is released which is used by Zooxanthellae for photosynthesis.

3. Working principle

The Calciumreactor KR 5000 is supplied with water at the water inlet (1). The flow rate should be adjusted

that way that the ph-value doesn't exceed 8.3 during the day or sinks below 8.0 at night. The pump circulates

the water internally. The CO

is connected at the injection port (3) at the bottom of the reactor. Through the

rotation of the impeller, the CO

will be completely dissolved in the water. Then, the CO

enriched water is

pumped below the Hydrocarbonate and finally circulated. Thereby, calciumbicarbonate is extracted from the

Hydrocarbonate. This is exactly the combination which corals need for their growth.

The outflow is located in the top of the filter. From there, the water flows into the aquarium or back to the filter

tank. The carbonic acid can be added from a pressure bottle.

4. Set-up

This version of the Calciumreactor is a closed system. The reactor can be installed below the aquarium from

where the water can flow into a filter chamber or back into the aquarium.