CO2 is the most important water plant nutrient. The plant will not grow in insufficient carbon dioxide condition, but it will be harmful to fish in high concentration of CO2. This shows the correct concentration of CO2 is very important. To predict the concentration of carbon dioxide by counting the releasing bubbles cannot reflect the scientific accuracy. This way always taken by those who have lot of experience in aquarium plant is not suitable to most hobbyists and beginners. AZOO CO2 INDICATOR can easily read the actual concentration of carbon dioxide just by color change of solution in long term. AZOO CO2 INDICATOR offers the best suggestion to your CO2 added way. Use it will assure your good start of successful plant aquarium.
1.Add 5 drops of CO2 test solution to test vial.
2.Fill aquarium water slowly into the test vial till the water level line.
3.Fit the bottom stand with the test vial tightly, and rotate it up side down as the figures.
4.Put AZOO CO2 INDICATOR inside the aquarium, approximately 10 cm below the water surface.
5.Compare the color in test vial with the appropriate color bar stuck to the outside of the tank. Most cases it will use color card 1 (KH=2-7). Use color card 2 as higher carbonate hardness (KH=8-15)