A woman in a greenhouse looking at her plants. Bottled CO2 is a great one-off option. Some recipes replace vinegar with muriatic acid (hydrochloric acid), which is not recommended as it is a very dangerous acid to work with since it can burn flesh, eyes, and your respiratory system. Fill the bottle about two-thirds high with warm, filtered water. Can logic help save them. The three most common choices are generators, tanks, and bottled CO2. Once finished, you can join the two bottles using the T-Splitter as shown below. //

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