CO2 is an essential component to promote the photosynthesis process of plants in aquariums. It helps various types of plants to be lush, healthy, and grow optimally. So how can you create a simple and inexpensive CO2 device at home? Let’s follow the article below with Aqua Plants Hub!
See more: How to DIY a CO2 cylinder from a fire extinguisher here.
Materials needed
A 1-liter plastic bottle and 2 plastic caps

You will need the following materials:
- A small soft plastic tube
- Sugar
- An air diffuser
- A pressure relief valve
- Silicone glue
- Yeast, bread, flour
- A little baking powder
- Scissors
Instructions:
- Mix yeast, flour, and sugar with water in equal proportions.
- Use a funnel to pour that mixture into the bottle and add water (The water level should be about 1/2 to 2/3 of the bottle, leaving space above for the CO2 gas to form. Tighten the cap securely and seal the bottle.
- Shake it vigorously several times to mix the ingredients together, then place the bottle in a cool, dark place, and after 1 to 2 days, CO2 gas will be produced.
- Use a small soft plastic tube or a medical drip tube to make the adjustment valve.

Note:
The appropriate position to place the CO2 tube is near the bottom of the tank, next to the filter, as CO2 will diffuse more effectively.
Every 3 days, gently shake the yeast bottle to mix the dissolved mixture, helping the fermentation reaction to occur more evenly throughout the bottle.
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