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Supplement containing highly concentrated fluoride. Fluorine is one of the main micronutrients contained in seawater. In a closed aquarium system, skimmer and filtration media remove fluorine deposits from the water, therefore its supplementation is necessary. Fluorine participates in the calcification process and supports skeletal tissue. Sodium fluoride and calcium fluoride are the building material of coral skeletons, therefore fluoride supplementation is necessary in a reef aquarium. Balanced fluoride supplementation, effectively strengthens the blue and white coloration of SPS corals, as well as highlight the fluorescence of most corals. Contains traces of potassium and iodine. Dosage: 1 drop per 100 l (27 US gal) of water daily. 1 ml of Fluorine (~15 drops) in 100 l (27 US gal) of water raises the fluorine level by 0,06 ppm. It is important that each aquarium is different and the dosage depends on the coral cast and individual needs. The recommended level of fluorine in aquarium water is 1.2-1.4 mg/l (ppm). Do not overtighten the screw, otherwise the cover might be damaged.