Salifert all in One makes the use of so called A and B calcium and alkalinity supplements unnecessary. It contains almost everything required for growth by corals and the beautiful encrusting pink and red coralline algae. All in One will increase the alkalinity (carbonate hardness), calcium, strontium, trace elements (except iodine) and amino acids. Calcium, strontium, carbonate (alkalinity) and amino acids are the major constituents of calcareous algae and the skeletal needles of soft/leather corals. Growth and multiplication of these organisms means depletion of those substances. The trace elements included in All in One allow organisms to carry out many biological reactions, which make photosynthesis possible. Iron is essential to many organisms for absorbing nutrients. Cobalt is essential for the formation of several coral pigments. Zinc is, like manganese essential for photosynthesis and is also used in the formation of calcium carbonate by corals. These are just a few of the trace elements present in All in One. This supplement is highly concentrated and contains for example approximately 35 000 ppm calcium, corresponding amounts of biologically activated bicarbonate and 700ppm strontium. The calcium is acetate based and is converted within minutes to calcium bicarbonate. Directions: Shake well before use. Dose 5ml per 100lts once a week.