Thanks for the tip! I'll look her up.

How do you get rid of the sulphuric acid solution after you've used it? I would think it's not something you want on your land (or maybe you can neutralize it first?)

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You can neutralize it with a base. But I don't really worry about it. I just dilute it and spread it out. It's just sulphur, oxygen and hydrogen. Our soil has lots of calcium carbonate in it which neutralizes it. I've tried using it as a dissicant spray to kill weeds with little effect.