When formulating Vital Earth's 3-2-2, we at Conscious Earthworks, LLC required that the All Purpose 3-2-2 be very soluble and complete. We started with a 15-4-2 high nitro bat guano and combined it with a few kinds of prized seabird guano from around the planet. We then added an all organic alfalfa meal, Vital Earth's Powdered Glacial Rock, organic calmag, and organic greensand. We reserved the highest npk guanos for all our Vital Earth's Blends: 7-7-2, 5-9-4, 0-9-0, 8-4-4, 3-2-2 and they are very soluble, so good aroma is key, and pure!