Calcium Concentrate™ Julian Sprung’s Reef Formula rapidly adjusts the calcium level. Use it to raise the calcium concentration when the alkalinity level is too high and the calcium level is low. Calcium Concentrate raises the calcium concentration and lowers the alkalinity level, bringing both closer to a natural seawater ratio. When the calcium and alkalinity levels are properly balanced, maintain them with a balanced supplement such as C-Balance or Kalkwasser. 500 ml (16.8 fl oz) bottle.
