<p>This two&#045;part calcium and alkalinity maintenance system adjusts calcium, magnesium, and strontium ions to Natural Seawater ratios, and achieves a balanced ionic residual&#046; Makes replenishment of calcium and alkalinity easy, and keeps your calcium and alkalinity in perfect harmony, assuring the optimum conditions for growing stony corals and coralline algae&#046;</p><ul><li>Packaged in two 16 oz bottles</li></ul>