Flourish Potassium Contains 50000 mg/l of potassium suitable for the natural planted aquarium. One of several elements that are vitally important to maintaing a vigorous level of growth in a planted aquarium. Can become depleted in a rapidly growing system or when the source water has a low mineral content. Size: 250 Milliliter Weight: 0.64 LBS. Manufacturers #: 466 Our Model Number #: 075227 UPC: 000116046602