Are you dealing with some widespread stubborn weeds? Or, have you got a pest problem in your grounds that’s ruining your flower beds or crunching through your vegetable patch? Then a knapsack spreader could be exactly what you need.
In our guide to all things knapsack sprayers, we’ll get you up to speed with everything you need to know, from their main functions to important maintenance requirements to keep your equipment in top condition.
What is a knapsack sprayer?
Sometimes also known as a backpack sprayer, a knapsack sprayer is a type of portable sprayer used to disperse liquid, from water to chemicals and many other things in between.
Knapsack sprayers are typically worn on the back of the user like a backpack (or knapsack). This makes it easier, safer, and far more comfortable to carry large amounts of liquid when applying it over a surface. To make them usable for longer periods of time, most knapsack sprayers are designed to be lightweight and ergonomic so that they can be used by a wide variety of people, from homeowners to seasoned industry professionals.
What are knapsack sprayers used for?
Knapsack sprayers are used for applying liquid solutions such as pesticides, herbicides, fertilisers, and disinfectants across landscapes. You’ll most commonly find knapsack sprayers used in agricultural, horticultural, and sanitation industries as they provide an effective way to spread liquid quickly and evenly.
Knapsack Sprayers can be used on anything from a small lawn in a residential garden to a large field on a commercial property. However, pest control is another common use for knapsack sprayers, as they’re an easy way to spread pesticides where you need them.
How to use a knapsack sprayer
It’s important to note that before using a knapsack sprayer, you should always consult the provided manual for specific instructions on how to use the sprayer. That way, you can ensure that you operate the sprayer safely and effectively. That said, there are some general steps to follow on how to use a typical knapsack sprayer:
- If you choose a battery-powered knapsack sprayer, the first thing you need to do is charge the battery. If you choose a manual model, you can skip this step.
- Prepare the liquid you want to spread according to the provided instructions in a chemical-safe container.
- Run clean water through the knapsack sprayer to remove any residue (if you have used the machine previously). Let it dry before introducing new chemicals.
- Very carefully pour the liquid into your knapsack sprayer tank and fasten the lid tight.
- Make sure the hose and nozzles are all undamaged and fitted securely before you start spraying.
- Once you’re ready, make sure you’ve got your sprayer in a comfortable position before beginning.
If you’re using a battery-powered machine, operation will simply require the push of a button. On the other hand, a manual knapsack sprayer will require you to use a hand-held pump mechanism to pressurise and spread the liquid. If you have a large area to cover, we recommend choosing a battery-powered knapsack spreader to conserve your energy.
Top tip: make sure to wear personal protective equipment (PPE) such as safety goggles or a face mask, and gloves to protect you from harmful chemicals . Exposure to substances such as pesticides, herbicides, fertilisers, and disinfectants can be incredibly dangerous, whether through skin contact or ingestion.
Key considerations before buying a knapsack sprayer
Now you know what a knapsack sprayer is and what it’s used for, you should be able to decide whether a sprayer is the right tool for your requirements. If you are in the market for a brand-new knapsack sprayer, keep reading as we cover three of the most important things to consider when purchasing your new machine.
Type of mechanism
Whilst browsing , you will notice there are different types of knapsack sprayers on the market. They fall into two key categories: manual or battery-powered. Manual pumps require the user to physically operate a lever or handle, while battery-powered models use an electrically-powered pump to pressurise and eject the liquid from the tank.
Battery-powered knapsack sprayers are less labour-intensive to use but tend to be the most expensive option. Manual knapsack sprayers are cheaper but they also require more physical effort to operate.
The Stihl SG51 Sprayer 12L is a great option for regular professional use but also for occasional domestic use. With a 12-litre capacity, it’s easier to use and lighter to wear than an 18L model.
Capacity
Knapsack sprayers come in a range of different sizes, which means they offer different capacities (how much liquid they can hold in the tank). For small spaces, smaller capacities are suitable as you have less ground to cover. They are also lighter, and can be easier to handle for beginners.
For example, the Stihl SG31 5L Sprayer is the perfect choice if you’re looking for something small that will be easy to use occasionally and simple to store. A 5-litre capacity makes this model light to carry and comfortable to operate.
For large areas, you should look for a knapsack sprayer with a higher capacity to reduce the number of times you will need to refill the tank, saving you time when you’re working.
Top tip: don’t forget, the more liquid a knapsack sprayer holds and the larger the sprayer is, the heavier it will be to wear and operate. Comfort is key when operating any machinery to ensure safety and efficiency, so make sure you’re choosing a knapsack sprayer that you can carry safely.
Functional features
As well as the type of machine (manual or battery-powered) and its size (capacity), you should also look out for the features each model offers.
More basic models will have fewer features, but more sophisticated knapsack sprayers have features designed to make your life easier and safer. Precision nozzles, shut-off values, adjustable hose lengths, and padded panels are all good examples of extra elements that make your knapsack sprayer more efficient and comfortable to use.
Let’s take a look at the Stihl SG71 18L Knapsack Sprayer as an example. Designed for professional use, with a large 18-litre capacity, this knapsack sprayer also contains integrated measuring cups and an innovative shutoff valve for precise application. Also, high-quality straps and a moulded back panel allow for greater user comfort, whilst the trigger pump can be used left or right-handed, and the length can be adjusted for comfortable, convenient use.
How to look after your new knapsack sprayer
In order to keep your knapsack sprayer in good condition, maintenance is key. Looking after your lawn care equipment will help increase its longevity, and ensure you can work safely and efficiently. So, we have included some great knapsack sprayer maintenance points
Rinse thoroughly before and after use
Before and after you use a knapsack sprayer, make sure to run clean water through the machine and rinse the filter with clean water too. This will remove any stagnant fluid from the tank, hose, and nozzle before you start and clean away chemicals once you’re finished so they don’t corrode or damage the machine.
Top tip: research the regulations in your local area on how chemical waste should be correctly disposed of.
Routine cleaning of chemical build-up
Over time, the nozzles on a knapsack sprayer can get clogged with residue from the solutions being pumped through it. If you spot this residue building up, clean it away with some warm water and a soft bristle brush to restore the full function of the machine and a safe, smooth flow of liquid.
Check for cracks and leaks regularly
Inspect your knapsack sprayer before and after each use. Keep your eyes peeled for cracks, loose parts, or other damage that might cause the sprayer to malfunction or leak. When dealing with chemicals, a faulty or damaged machine is extremely dangerous. So, if you spot any problems, no matter how small or early on, it’s essential to act fast.
Don’t use your knapsack sprayer again until it is repaired or replaced, depending on the extent of the damage.
Store your knapsack sprayer properly
Make sure to store your knapsack sprayer in a cool, dry place away from direct sunlight and corrosive chemicals. A shed, garage, or storage unit is the ideal place. You should also ensure your storage space is as waterproof as possible to remove the risk of moisture damage.
Choosing the best knapsack sprayer for you
If you’re looking for a small sprayer for a domestic garden, your best knapsack sprayer will likely have a lower capacity and overall weight. However, if you’re a professional user covering large grounds or lawns on a regular basis, you should consider buying a larger knapsack sprayer to keep up with the demands of your job.
If you require any guidance, don’t hesitate to contact our friendly team who will be more than happy to help. We offer a range of knapsack sprayers, from smaller 1.5L handheld spot sprayers to larger 12L and 18L backpack sprayers for more heavy-duty tasks.
Top tip: investing in quality brands such as Stihl will ensure your knapsack sprayer is robust and well-made, reducing the risk of malfunction and harmful leaks.
Shop Stihl knapsack sprayers right here at Hughie Willett Machinery
Here at Hughie Willett Machinery, we have decades of experience providing high-quality groundcare equipment to domestic gardeners and professional landscapers alike. We believe that you should never compromise on quality, which is why we always stock high quality equipment from leading brands.
Explore our range of Stihl knapsack sprayers today to find the best one for you. And, if you’re having trouble deciding, get in touch with our team for more personalised advice.
Order your new knapsack sprayer today
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