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How To Use A Knapsack Sprayer

How To Use A Knapsack Sprayer

    You will need: 

    - Knapsack sprayer 

    - Clean water 

    - Chemical jug 

    - Liquid fertiliser/herbicide/fungicide 

    - Correct PPE (overalls, rubber boots, chemical resistant gloves & face shield) 

    What is a Knapsack Sprayer? 

    A knapsack is a type of sprayer that disperses liquid through a hand-held nozzle that is attached to a pressurised reservoir carried on the operators back. Knapsack sprayers can be used to apply liquids such as fertilisers, herbicides and fungicides for example and is suited to spot treating areas.


    - Assemble your sprayer (if new) following the manufactures instructions.

    - Ensure you are fully prepared with the appropriate PPE (Personal Protective Equipment) including rubber boots, coveralls, gloves and a face shield. 

    - Ensure the sprayer is calibrated to the required dosage – see our guide on How To Calibrate a Sprayer

    - Fill the spray tank with the required amount of water, we recommend always reading and following the manufacturers label and instructions before use and using the rate suggested.

    - Measure the chemical needed in a mixing jug in a safe environment. If the chemical container is new and is sealed with a foil, simply turn the cap upside down, press onto the foil seal and twist to remove.

    - Add chemical into the sprayer with the water. We recommend not mixing more than what is needed.

    - Triple rinse the measuring jug.

    - Agitate the sprayer to make sure the liquid is fully mixed.

    - Now you are ready to spray. Put the sprayer on your back and adjust until comfy.


    PPE Personal Protective Equipment must always be worn when using a knapsack sprayer. This includes Overalls, Rubber Boots, Chemical Resistant Gloves & a Face Shield