Components Strong is Aquaforest's concentrated trace element set, designed to be dosed alongside their Calcium, Magnesium, KH Buffer, and Reef Mineral Salt products as part of a complete Balling-method reef dosing system. It's sold only as the full 4-bottle set, since each component is formulated around the others rather than as a standalone additive. Component A - concentrated strontium and barium; add 5 mL per liter of prepared calcium chloride solution (19 mL per US gallon). Use alongside Aquaforest Calcium. Component B - concentrated heavy metals; add 5 mL per liter of prepared calcium chloride solution (19 mL per US gallon). Use alongside Aquaforest Calcium. Component C - concentrated iodide and fluoride; add 5 mL per liter of prepared sodium bicarbonate solution (19 mL per US gallon). Use alongside Aquaforest KH Buffer. Component K - concentrated potassium; add 5 mL per liter of prepared magnesium chloride/mineral salt solution (19 mL per US gallon). Use alongside Aquaforest Magnesium and Reef Mineral Salt. Each 75 mL bottle's dosing amount is set relative to your calcium and magnesium needs - using the complete Aquaforest system is what keeps trace elements in the correct proportion.