When to use? All plants need carbon to grow. Aquatic plants obtain their carbon through CO2 dissolved in water. With Liquid CO2 Boost, plants will grow more vigorously, removing algae-causing macronutrients such as nitrate and phosphate. Use daily, or every other day, to provide plants with a regular and consistent supply of carbon. How to use? • Calculate the volume of your aquarium in litres (length x width x depth (in cm)/1000). • Turn dispenser to unlock, then press down on the pump to dispense. For best results: Use in conjunction with Plant Boost to provide the trace elements and micronutrients required for healthy plant growth. Treats: 100 Litres