Doff Path & Patio Weedkiller treats weeds and grasses growing between paving slabs, reaching right down to the roots. Use on paths, patios and gravel. The ready-to-use formulation is supplied in a trigger spray pack for convenience. The weedkiller is biodegradable and does not stain or mark paving. Contains 7.2g/litre Glyphosphate. Size 1 litre.