5 litres of pre-mixed refill for the Pump ‘N Go 5 litre sprayer, making weed control convenient and economical. Ideal for paths, patios, drives and flower beds Kills weeds right down to the roots Degrades in soil to allow replanting Contains glyphosate 5 litres Roundup is a deceptively fast worker. After initially spraying Roundup on to a weed, you might be forgiven for thinking nothing much is happening, apart from some visible yellowing of the leaves and stem after 48 hours. But, that's just on the outside. On the inside of the weed, the systemic action takes Roundup right down to the weed's growing points and, put simply, kills the weed from ‘inside out'.