Aquarium CO2 Generator System

The Aquarium CO2 Generator System will generate up to 90ppm of carbon dioxide in your aquarium. The material is made of stainless steel, which makes it durable and long-lasting. It also helps maintain the pH levels in the aquarium, preventing any issues caused due to fluctuations. Specification: Material: Stainless Steel Meters Diameter: app.4cm / 1.57in Bottle Hat Diameter: app.3cm / 1.18in Color: As the pictures shown Quantity: 1 Set  What do you need to prepare for this system? Below (not included) 2x2 Liter Coka Cola plastic bottle 1x200g citric acid or 200ml vinegar 1x200g baking soda Tips to install: The bottle must be a carbonated drink bottle, do not use pulpy, green tea, water bottles mineral, etc. Avoid cutting the adjustment valve from sudden large or small, can not suddenly turn up, after immediately turn off again, so as not to cause abnormal pressure to the bottle. Note: Be sure to carefully observe the direction of the parts before assembly. The usual wrong-way h