Baracuda Spa Calcium is a 100% essential mineral that helps prevent water balance problems and protects equipment and surfaces in your spa from corrosion. Baracuda Spa Calcium is used to raise calcium levels in your Spa. Keeps your spa water balanced for optimum bather comfort. Use with Baracuda Spa Test strips. Protects surfaces and equipment from corrosion. For the best results, always use Baracuda Spa Calcium according to the directions on the package.