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.