PRO K 20 is a one of a kind pure potassium source derived from fruit rinds. The potassium found in PRO K 20 has been extracted directly from plant material in an unaltered state. The benefit of this process to the end-user is a clean, organic, highly available source of potassium without the sulfates, chlorides, or nitrates that accompany conventional fertilizers… thus reducing burn potential and other limiting factors.