Carbon Dioxide is an important element for aquatic plants. Other than the necessary nutrients and sunlight; carbon dioxide is one of the key elements for plants making food (such as photosynthesis process). Dymax Carbon D Plus is a source of bio-available organic carbon needed by all aquatic plants. This organic carbon is typically obtained from carbon dioxide (CO2) which will help to restore ferrous iron from ferric iron in liquid form to dissolve easily in water for quick plant absorption. Directions: Add 5ml (1/2 capful) of solution to every 60L of water for new tank or after more than 40% water change in established tank. Dissolve with some water before adding directly into the aquarium. Thereafter add 5ml (1/2 capful) of solution to every 200L daily or every other day. This dose can also be used as algae control. Dosing may be slowly increased in high-growth planted aquariums. Can work in conjunction with CO2 injection. Shake well before use.