I’ve read some on using carbonated water in plants. Plants that like acidic soil have shown twice the growth in tests. MJ is not one of those plants that enjoy the extra acid although if you add it, you may see some extra growth until the soil locks up and the plant quits taking on nutes due to ph problems. Also, just running plain PH water thru a soda maker like mine will lower the PH so if you do add carbonated water you really have to watch your PH run off. Some articles suggest to mix plain and carbonated water or just do the carbonated water every other water. Me I’ve had problems with PH my last grow and am determined to get a hold of it more this grow. Although I am open to all suggestions and sometimes let my own ideas run around in my head to long. I decided that this is no time to try the carbonated water thing even tho it did take up a whole night of reading on the subject. If we had more than a 4 plant limit in my state I would probable be trying all kinds of experiments