How to Open a Weed Sprayer Point the wand at an area with weeds that you want to spray and then pull the trigger to spray the chemicals onto the weeds until the sprayer stops spraying. Put on a pair of work gloves to protect your hands from any foam created inside the canister. Place the canister on the ground and grip the canister in one arm. Click to see full answer. Also asked, how do you open a pump sprayer?Push the pump handle all the way down and turn counter clockwise into the locked position. Continue to turn the pump handle counter clockwise until the entire lid starts to turn and unscrew. This can be difficult sometimes if the lids are put on very tight.Also Know, what is the best garden sprayer? 5 Best Garden Sprayers Field King Garden Sprayer – Best Overall. Check Latest Price on Amazon. Smith R200 Garden Sprayer – Best 2-Gallon. Check Latest Price on Amazon. Chapin 26021XP Pump Garden Sprayer – Best Value. Check Latest Price on Amazon. Solo 418 One-Hand Gardening Sprayer. HOMEDECISION Lawn Pump Garden-Sprayer. Also, how do you use a garden pressure sprayer? Knapsack Sprayer – Operating Instructions Fill the Knapsack tank to the required level. Screw cap down until it is firmly closed. Pump the operating arm until you can feel the pressure. Lift the Knapsack sprayer onto your back. Engage by pressing lever. Continue to intermittently pump the operating arm to maintain pressure. Can you put paint in a pump sprayer?Although paint may be applied with a brush, roller or pneumatic sprayer, a pump sprayer will achieve similar results.