This broadcast and spot sprayer should only be used to apply one chemical(pesticide, lawn food, etc.) at a time to ensure proper spray coverage for each individual chemical. Also, we recommend that the sprayer not be used for other purposes once it has been used for spraying pesticides. Any chemical will leave some residue in the tank liner or sprayer components even after the sprayer has been properly cleaned. These residual chemicals can have unexpected effects on future uses. For example, spraying water or other liquids that are contaminated with residual pesticide may result in unforeseen hazards to plant or animal life.