KALIX Potassium is fully soluble and contains 50% potash naturally derived from potassium sulfate, making it ideal for boosting potassium levels during all phases of plant growth. During fruiting and flowering, large amounts of potassium are quickly used by the plant. KALIX Potassium can help with boosting potassium (K) levels, treating deficiencies, and optimizing your feeding regimen. Works in conjunction with all nutrient and feeding programs. 25 Lb bag.