Natria Flash Concentrate 3 litre - SBM. With Natria Flash your terrace, driveway, path and borders can be made weed-free in a flash.Visible result within 3 hoursCan be used on paving100% natural active substancesHandy application methodSpot sprayingApplication advice:The weeds must be completely sprayed however, prevent the weeds from dripping spray onto plants that you dont wish to kill. Preferably use during optimal growing weather conditions, such as sufficiently high temperatures and plenty of sunlight. The best results are obtained when Natria Flash concentrate is applied to young weeds. Do not apply if precipitation is expected within 1 or 2 hours after application. A fast-acting pesticide.Precautionary measures:If applied to high weeds or under unfavourable conditions, a reduced effect must be taken into account.