how to mix roundup concentrate
Full Answer. 1  Prepare the handheld sprayer Open the top of the sprayer, and make sure any old residue is cleaned out. 2  Fill the tank with water Pour water into the tank with a hose. 3  Add the Roundup Pro concentrate Pour the concentrate into the tank. For most residential jobs, you will need to add 2 ounces of Roundup Pro for each gallon of water. Agitate the sprayer Close the top of the sprayer and shake it to mix the water and Roundup Pro concentrate.