Hi Ya, I bought some ammonium sulphamate to use as weed killer. The instruction that came with it were good. How ever, there are a lot of things that using this product do to the ground I would read the instructions very carefully. What I read under the H&S advice put me of using it. Indeed they say its a good compost activator, well I am not sure about that either especially if you have worms in the compost. It may be ok as an initial build but is detrimental to wildlife, ie worms, I was surprised at its content so please be carefull.