roundup contains 360 grms glyphospate per lte and there are loads of generics out there avoid the roundup name as you are paying through the nose for it. some of the generics are scutchout, gallup, glygos360,asteroid,envision and at least another half dozen i know as i sell sprays etc. Avoid garden centres at all costs as you will be screwed!! on price hit to small hardwares or co op stores or general farm stores for best prices. For weeds on lawn look for a product called Mortox(hygeia in galway) used on lawns, pitches and golf courses excellent product and well priced. 1ltr retails at approx 16/20E application rate is 75mls per 5 ltr.