This product has the warning it does, because its an extreme base. Its 99% sodium carbonate. Very similar to baking soda(sodium bicarbonate ). Would I use it? Probably not.
Something as seemingly safe as hydrogen peroxide from the pharmacy vs. food grade hydrogen peroxide, has drastically different results when consumed. Because of the process of production one is safe, where the other is toxic. Just one example of something that seems safe but can harm even though they are almost the same.
I urge everyone to know what you are using and if it was produced in a way that is safe to consume. Something safe to spray on fruits and vegetables, which maybe washed off of the skin, likely isn't safe for bud. Especially bud that is consumed by combustion.