Carbon is one of the mostr important element used by all plants for  photosynthesis PLANTOZ Liquid Carbon provides multiple complex and simple carbon forms for easy absorption by aquatic plants. Contains naturally occurring phytohormone that Stimulates plants growth and fights against udersirable algae. Can be used with or without pressuriesd Co 2 supplement, safe to use in freshwater aquariumsd, does not alter pH. Substitute for Co 2. Keeps algae in control. Use with PLANTOZ Macro Nutriends, Micro Nutrients and Root- Tab for better result.