Monopotassium Phosphate Fertilizer 0-52-34 100% Water Soluble Hydroponics"Greenway Biotech Brand" 10 Pounds Monopotassium Phosphate fertilizer contains 52% Phosphorous and 34% Potassium and is water soluble. Great Source of Water Soluble Potassium and Phosphate It Helps With Roots Strength, Buds, and Blooms Great Water Soluble Fertilizer For All stages of Growth