NPK RAW Potassium 25lbs: RAW Potassium contains 50% Water Soluble Potash derived from potassium sulfate. During fruiting and flowering, large amounts of potassium are used by the plant in a matter of days which can lead to potassium deficiencies. RAW Potassium is ideal for boosting Potassium (K) levels, treating deficiencies and creating optimal recipe solutions. Works in conjunction with all nutrient and feeding programs.