Metsulfuron Methyl. With a name like that, it sounds like nasty stuff. It is actually a very safe, low toxicity, highly effective weedkiller. Labelled and designed to control bush and broadleaf weeds in native pastures, rights of way and industrial areas, SureFire metsulfuron methyl can also be used to control domestic weeds. It is recommended to only do a spot spray on weeds rather than broad spraying as it is powerful gear that kills lots of different types of plants, as well as weeds.For domestic application, 5g of this mixed into 10 litres of water is plenty to eliminate tough weeds. Always follow the label for mixing and usage instructions.