I've tried it and there was no increase in produce in my case. When you atomize "spray" sparkling water onto the plants much of the co2 precipitates before it hits the leaves. I've never tried watering the soil with it however this might be a better delivery system. Only the co2 exposed to the most oxygen would precipitate.

Herbus
Herbus Reviewed by Herbus on . Watering with carbonated water really good? Or with sparkling mineral water? I read that plants love the CO2 in the stuff in the Big Book of Buds. Rating: 5