Highly-concentrated ionic potassium solution, Provides potassium, an important component of aragonite (the mineral secreted as skeletal material by corals and other reef-building marine organisms), complexed into pigments that enhance blue coloration of some small-polyp stony corals, important to proper neurological function, and depleted in marine aquaria by livestock, 80,000 ppm K; considerably stronger and more economical than competing potassium products, May be used to combat potassium depletion that often accompanies the use of zeolite-based filtration methods employed to maintain ultra-low-nutrient aquaria, Formulated by a marine scientist, Liquid, 500-ml, SKU: RYLHC1047