Powder fertilizer is a water soluble fertilizer for fish ponds. This products helps to create an alge bloom that lasts for about 20 to 30 days before dissipating that feed the small fish in your pond. The resulting growth in the number of the small fish then feed the larger fish. Powder fertilizer can help make your pond healthy. Make no mistake, a harmonious balance between nutrients and oxygen is not the end-all be-all solution to all pond problems. Certainly there are diseases and other ailments that are started by other reasons, but having a healthy, stable pond environment goes a long way in preventing pond problems. Powder fertilizer is not a benign product if used excessively. Read and follow application instructions carefully. If you have any questions about what to do to improve your pond/lake's health, consult with your county extension agent who can assist in recommendations. Analysis 10-52-4 (nitrogen, phosphate, soluable potash). Apply at a rate of 4 lbs per acre surface.