Instructions: 2 x 2L Carbonated Beverage Bottles, e.g. Coca-Cola (Not included) 200g citric acid powder, 200g baking soda. (Not included) Separately paste AB bottle labels. Close the on/off valve. Cut the funnel and fill the test tube with citric acid.

Bottle A Pour the remaining citric acid powder into the bottle A Mix with 600ml water and shake until dissolved. Bottle B 200g baking soda. Mix with 200ml water. Open the test tube and drop it into bottle B. Then screw cap A onto bottle A. Screw cap B onto bottle B. Shake bottle B for about 5 minutes.

During this process you can see bottle A bubbling. When the pressure reaches 1kg/cm (15psi), it is ready for use. Keep the acid-absorbing ball underwater at about 1cm. Connect the micro-adjustable valve, tubing, check valve and the diffuser. Now you can open the on/off valve and micro-adjustable valve to introduce CO2 into your tank.

• Package included: 1 x CO2 generator body kit 1 x micro-adjustable valve 1 x 1.6m/5.2ft CO2 tubing 1 x quick-reaction test tube 2 x funnel 2 x self-adhesive bottle label 1 x user manual