Working with CO2 in aquaristics is expensive and I thought this set would be a good alternative. However, I did not expect to receive and try it. work. Now baking soda and water are available, but citric acid is not. It would be nice if they included a small package or something. Instead I had to buy it from Revain as I couldn't find it in any commercial grocery store. Actually the functionality of the product is another matter, I had a hard time getting it to work. I don't know if it was the instructions or my citric acid, but it was really hard. I would only recommend investing in a proper CO2 system.
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