The Fritz RPM Elements Calcium Buffer System is designed to maintain optimal levels of calcium and alkalinity in saltwater aquariums, which are crucial for the health and growth of corals, fish, and other marine life. This system consists of two parts: Part 1 provides high purity carbonate alkalinity, while Part 2 ensures that these components remain in their proper ionic balance when used alongside regular water changes with a quality salt mix like Fritz RPM Salt. Unlike many similar products on the market, this buffer system does not include unnecessary ions or metals that could potentially be harmful to aquarium inhabitants.