The water plant fertisizer provides the nutrients and water plants need in pond or aquariums and also enables a grapid growth. It does not change water PH. Harmless to fish. Helps to prevent algae.Provide essentail nutrition to the water plant for up to one year.Contain trace element to help water plant to grow and maintain chlorophyll.Phosphate and nitrate free.No effect on pH value and water hardness.