BioAdvanced All-In-One Lawn Weed & Crabgrass Killer Ready-To-SprayHow to Use STEP 1: Hook the bottle to a hose and turn on. STEP 2: Extend the hose tot eh farthest area to be treated, point sprayer nozzle in direction to be sprayed. STEP 3: Begin spraying push ON OFF switch forward into ON position. STEP 4: Walk at a steady pace while spraying, using an even sweeping motion and slightly overlap treated areas.