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Calcium is one of the most important elements in the saltwater aquarium, as many corals, other lower animals and the useful calcareous algae use calcium to build their skeleton. Ideal values ​​are around 400 – 450 mg/l. Check the calcium content regularly to prevent stunted growth. In addition, a high calcium value also promotes the stability of water quality. Keep out of the reach of children. Contents: test reagents, measuring cylinder, instructions.