Place the deck sprayer on a level surface and remove the screw cap on the top of the plastic reservoir.
Insert a funnel into the opening of the sprayer.
Protect your hands with a pair of rubber gloves and your eyes with safety goggles.
Pour the liquid into the opening of the deck sprayer. Do not overfill the sprayer. The recommended fill line will be indicated on the side of the plastic reservoir.
Remove the funnel from the opening of the sprayer and screw the cap securely on the opening.
Consult the instruction manual for your deck sprayer and determine the appropriate number of pumps required to maintain pressure inside the tank. Once you have determined a safe number of pumps, lift the handle on the top of the sprayer and pump it up and down as recommended.
Push the handle down and lock it into place by turning it clockwise once you have finished pumping.
Grab the deck sprayer with one hand to carry it and hold the deck sprayer's wand in the other hand. Hold the tip of the wand 5 to 6 inches away from your intended target and squeeze the end of the wand to spray. Pump when necessary to restore pressure inside the reservoir.