To adjust a spraying system with a piston pump, follow the general guidelines outline below. Open the control valve and close the boom valve. Adjust relief valve to pen at a pressure 10 to 15 psi above spraying pressure. Open boom valve and make sure flow is uniform to all nozzles. Many pesticides are so toxic that exposure to even a small amount can kill and adult.
Children can succumb to less.
Minimize any kind of oral, dermal, or inhalation exposure to chemicals. Below are just a few safety precautions. Read the sprayer operator's manual and chemical labels to review recommended procedures for safe use of chemicals and the equipment. Never allow them to play in pesticide-treated fields or in areas where the chemicals may be spilled. This includes areas where runoff or drift may be present.