I didn't look too far into it, but isn't sodium hydrogen carbonate just a synonym for sodium bicarbonate? If so, there shouldn't be a problem adding that to your water...as it's basically the same thing as baking soda. People have used baking soda for ages to raise the pH level of water in fishtanks. It certainly doesn't harm fish, so I see no reason why it would harm your plants.

Hope that helps.:rastasmoke:
Mr. Clandestine Reviewed by Mr. Clandestine on . noob ph question hey guys, gotta question here.. so if I wanted to raise ph levels of my soil.. could i use some ph/alkalinity up for spas. The ingredient is "sodium hydrogen carbonate" Could i just mix this into my water in very small amounts to make the soil less acidic.. i think another name they use for it is "soda ash" Rating: 5