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Calcium reactors are for use in reef aquariums where there is high population of calcium using animals for example,
hard corals. In aquariums with ideal conditions that cause rapid coral growth this depletion of calcium can cause calcium levels to be too low even with the use of calcium supplements & frequent partial water changes. The accepted level for calcium in a marine aquarium is 400-450 ppm, if your calcium level is persistently below this level a calcium reactor will help boost these levels. Depending on the size of reactor you require expect to pay £90 upwards, and an additional £100 for the CO2 dosing equipment.
Deltec fluidised calcium reactor (no media present) AB Aquamedic calcium reactors with media.
Calcium reactors need a steady supply of carbon dioxide gas and calcium depleted aquarium water feeding the reaction chamber. Carbon dioxide gas is acidic and lowers the pH in the reaction chamber. This acidic water reacts with the hydrocarbonate media causing it to dissolve and release large quantities of calcium carbonate. The calcium from this solution is then drip fed back into the aquarium to raise the calcium level.
All calcium reactors will require a source of Carbon dioxide, normally in the from a pressurised cylinder. Some form of regulator to control the flow of carbon dioxide gas. These are not generally included in the purchase price of any reactor on the market. In addition to this a pH probe and solenoid to monitor and control the reaction are recommended, although with careful setup and monitoring these can be dispensed with.