Triple Super Phosphate
Triple Super Phosphate is made by the action of Phosphoric Acid on raw Rock Phosphate [also called Appatite]. It typically contains 46% Phosphate, soluble in neutral ammonium citrate and water. Of this, typically 90% is soluble in water alone. Because the phosphate on TSP is never completely water-soluble, it cannot be used in the manufacture of clear-liquid fertilisers.
Triple Super Phosphate for the European market comes from North Africa or from sometimes from Florida, trans-shipped at Rotterdam.