Correct angle: Keep the nozzle pointing downwards, and keep it quite close to ground level, to avoid spray drifting onto unwanted areas. The spray pattern widens with distance from the nozzle.
Spray quality and width: For most home garden sprayers this can be adjusted by twisting the terminal nozzle to select a suitable droplet size and width of overall spray pattern.
Coarse spray: This is less likely to drift onto nearby plants, and while a wide spray pattern allows quick coverage of a large area, a narrow spray pattern allows safer spraying in small areas.
Blockages: Using a coarse spray for a few seconds can dislodge accumulated residues that may be blocking the nozzle. Blockages usually become evident by a coarsening or dribbling of spray. The screw on the handle allows ‘bleeding’ of the system above the terminal nozzle. This may be useful for shifting residues that may be blocking the lance or valve above the terminal nozzle.