Like the RoundUp Pro you've come to know and trust, Roundup Pro Max is a non-selective post-emergent that controls a broad spectrum of weeds with virtually no re-growth. Roundup Pro Max has a unique surfactant system that's more concentrated and gets to the root faster, so you don't have to worry so much about the weather and rain washing the product away. For this product to be effective, make sure that weeds have emerged at the time of application. This product comes in a 1.67-gallon jug with a 6 ½ fluid oz measuring cup.