i had similar issues, for a temporary fix try mixing a bit of hardwood ash into the water (this is assuming you're growing in soil). It wont permanently fix your problem since the molarity of the ash and water mixture is pretty low, but it will help slow the damage done to your plant atleast.

and as ganjaguerilla said...stay away from baking soda if you can.

btw i recently watched the video you made on ph and flushing GG, and i gotta say, thanks man. The video really cleared up alot of stuff for me and helped me to understand what preventative measures i should take and how to fix things should said measures fail.