Caribsea ARM Extra Course for Aquarium Reactors has the largest granule size and is least likely to clog equipment, resulting in the lowest maintenance option. It is widely regarded as one of the most reliable calcium reactor media in the industry. The media is a complete solution that contains calcium and carbonate as well as trace elements. It has nearly 50 times the strontium content of other brands (7390ppm), precision grading allows for maximum carbon dioxide penetration, no gastropod shells means the lowest phosphate content (less than 1/10th of 1ppm), and the highest solubility of any reactor media.
