Reef Foundation A contains Calcium, Strontium, and Barium according to the ratios found in coral skeleton. For best results dose according to a measured uptake of calcium and in conjunction with Reef Foundation B and Reef Foundation C.
500 ml / 16.9 fl. oz
Concentration: 1 ml will raise the Ca level of 100 liters (25 gal) by 2ppm.
For proper use of this product you may want to use the Red Sea Calcium Pro Test Kit