Carbonate | Hydrogen Carbonate | Buffer. Reef Essential® Argonite B™ is designed to provide carbonate, hydrogen carbonate & buffers to help stabilize pH and build strong aragonite. Carbonates help to stabilize pH within saltwater aquariums due to their buffering capacity. This product must be used alongside our Reef Essential® Aragonite A™ & Reef Essential® Aragonite C™ supplements as together they will provide the required major, minor and trace aragonite elements. If wanting to enhance coral tissue colour & growth, we recommend our Bioactive Colour Intensifiers™. Recommended alkalinity concentration = 7.4-10.5dKH (132-188ppm).