TheBlock Blitz Gravel Treatmentis a self cleaning gravel detergent in powder form made from a dynamic mineral and plant based formula.Key Features:Utilises soft wash technology meaning no physical or mechanical action is needed for the barrier detergent to work.Repels dirt and grimeWith continued use, will deter up to 90% weed growth and up to 99% moss growth100% non-abrasive, contains no bleach, acids or biocides and is biodegradableKeeps on cleaning and protecting for up to 6 monthsCan be used on gravel drives and decorative aggregates1 x 380g pouch is diluted into 10 litres of cold water and covers 15sqm of paving, approximately one and a half car parking spaces