“…The process is unique in this country in that it yields, directly, in continuous operation a granulated triple superphosphate.Triple superphosphate is a highly concentrated phosphate fertilizer containing 43 to 48% available phosphorus pentoxide, P2O5. In 1930, production in this country from five plants amounted to only 100,000 tons; by 1952,13 plants were in operation producing over 862,000 tons.…”