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Supplement containing highly concentrated potassium. Potassium is an important element responsible for neurological functions. In soft corals, potassium participates in the transport of nutrients. In SPS corals the deficiency of this valuable element causes a faded pink and red color. Usage of zeolites-based filtration media in the aquarium may lead to potassium deficiency. Regular and balanced use of Kalium allows maintaining proper level of potassium and strengthens the red and pink coloration of SPS corals. The recommended level of potassium in the reef aquarium is 360-380 mg/l.