Roundup Ready-To-Use Max Control 365 Refill will kill and prevent weeds for up to 12 months by creating an invisible barrier. Not only does it kill visible weeds, but it also kills them down to the root, guaranteed. Simply pour the ready-to-use refill into an empty Roundup Brand Premium Sprayer or an empty Roundup Ready-To-Use Max Control 365 bottle. For use on driveways, patios, sidewalks and gravel areas, Roundup Ready-To-Use Max Control 365 Refill is rainproof in 30 minutes with visible results in 12 hours. | RoundUp Ready-to-Use Max Control 365 Refill | Size 1.25 gal