DIY CO2 system for aquarium – citric acid + baking soda

2 liter PET bottle from Coca-Cola – A 200 g of citric acid 600 ml water 2 liter PET bottle from Coca-Cola – B 200 g soda 200 ml water mix A – 600 ml water and 200 g citric acid tighten the valve squeeze the bottle A so that a mixture of the mixture […]