In this guide we’ll take a look at the best knapsack sprayers for the UK market.
I’ve compared spray distance, capacity, functionality and cost
to give you my top recommendations.
What is the Best Knapsack Sprayer?
In a rush? Here’s my top choice…
Versatile and comfortable, 20 mins spray time from just 23 pumps!
This Hozelock Pressure Sprayer is extremely well designed, offering you a comfortable 3-in-1 rucksack-style strap to help take the pressure off. Just 23 pumps will provide 20 mins of spray time. Plus, its 7 L capacity, lightweight construction and adjustable spray nozzle make it easy to use continuously.
Things to Know Before Buying a Knapsack Sprayer
Anyone with a large garden will know how much of a full-time job it can be to effectively eliminate weeds and pests.
Hauling bottles and buckets of weed killer around with you is exhausting, and if your weed killer spills onto your plants, it may kill them too!
Introducing a knapsack sprayer into your life for these jobs will be a real game-changer – you can safely carry your weed killer or fertiliser around with you and the weight will be comfortably distributed across your back.
If you’re considering purchasing a knapsack sprayer but not sure what to look for, take a look at these top tips:
It’s essential that your knapsack sprayer is made from thick materials that won’t corrode when exposed to harsh chemicals.
Most knapsack sprayers are made from sturdy, hard-wearing plastic, and you should ensure that the hose, lance, fittings and seals are all made of good quality materials too.
Checking the weight of the product can also act as an indicator of material quality. Whilst high-quality, lightweight plastics are certainly more available nowadays than ever before, a product which is extremely light may suggest low quality.
No matter the quality of your knapsack sprayer, it won’t last as long if you don’t wash it out well between uses. If you’re using any chemicals, such as weed killers, make sure that none of the solution is left in the tank after use – it could corrode the plastic over time.
If you plan on using your sprayer for a few years, it’s good practise to check that you can easily replace broken parts. Ultimately, this will save you money in the long run.
The size of the sprayer you need will depend on what you hope to use it for.
Generally, a 5 L tank will be best for small areas. So, smaller gardens, patios, and standard driveways. A 5 L tank will also mean a lighter unit when full, which might be more suitable if you aren’t able to support heavy weight for a long period of time.
Of course, with a smaller tank capacity you will have to fill it more often if you plan to do larger jobs.
For large driveways or gardens that need a lot of care and maintenance, a larger tank will save you time as it won’t need refilling as frequently. Keep in mind that a larger tank will add a considerable amount of weight to the unit when full.
Choosing the right capacity ultimately comes down to how large the area you want to treat is, and how much weight you can comfortably support.
In terms of task-completion time, you may find it more effective (and safer!) to have a smaller unit which you can move around with more easily, rather than a larger one.
Following on with the subject of unit weight, you’ll find it far easier to carry a full knapsack sprayer if it’s comfortable.
Backpack-style straps are generally more comfortable than shoulder straps, especially if you’re going to be using the unit for a long period of time.
I recommend looking out for adjustable and padded straps, as well as an ergonomic pump handle and trigger. These will also reduce the strain on your hands.
Look for a trigger that can be locked in an ‘on’ position. This will mean you won’t have to constantly apply pressure to create a continuous flow. It will therefore prevent aching hands and blisters.
Finally, take a look at the length of the lance and hose.
A hose that’s too short will mean you are stooping continuously whilst working. This will cause pain and may also slow tasks down because you’ll have to constantly stop and stretch.
Make a note of the lance length in the product description and measure this against yourself. If you have to bend so that this measurement reaches from the floor to your hand, the lance may not be long enough for you.
The nozzle should also be adjustable so that you can choose the right setting for your requirements – at the very least you’ll want a jet option and a spray option for different jobs.
Everything I Recommend
More Detailed Knapsack Sprayers Reviews
Hozelock Pressure Sprayer Plus 7 Litre Review
The Hozelock 7 Litre Pressure Sprayer is sturdy and well built, with a lot of versatile features.
The straps are fully adjustable, making it comfortable for anyone to use and wear. Plus, the nozzle can be changed to produce an array of sprays, from strong jets to mists. You can also ‘lock’ the flow to enable continuous spraying.
What’s more, the unit is relatively light, weighing only 1.77 kg (when empty) which is a good sign because you don’t want it to be too heavy from the get-go.
The tank is easy to fill and made of really thick plastic which is essential considering you will be using it for weed killers or pesticides. Plus, it’s made of translucent plastic that has measuring marks on the side, making it very straight forward to mix chemicals to the correct dilution.
I used this product to clear a bed of nettles in an overgrown part of my garden – it was light and comfortable to use, spraying evenly with no clogging or leaks.
The pressure provided by the unit is excellent. I pumped around twenty times and this gave me about 15 minutes of continuous spraying. A really good pump-to-spray yield!
The lance supplied is a little on the short side, not a problem for me spraying nettles, however, if you were spraying paving you might need to stoop a little. However, a longer lance is available at a reasonable cost, so this still makes this sprayer great value in my opinion.
One thing to be aware of is that the max. fill of this product is 5 L, despite it having a ‘7 L capacity’. The manufacturers recommend leaving 2 L free to provide a sufficient air gap to allow for pressurisation.
Overall, this product is effective, sturdy, easy to use and excellent value for money. It will save you time and is the best knapsack sprayer, especially if you’re working in small to medium areas.
Faithfull 16 Litre Knapsack Sprayer Review
The Faithfull 16 Litre Knapsack Sprayer is an excellent choice for larger gardens.
This is a well built and solidly made unit. All the components are made of tough plastic and look like they will last many years. The product description explains that they are shatter and frost resistant which is good to know.
The design of the sprayer makes it comfortable to use, even when the large tank is full. The straps are fully adjustable, and they distribute the weight evenly – I didn’t experience any strain on my back or shoulders when I used it.
You might need some help lifting it on to your back if you fill the tank completely; however, I found I could manage to take the knapsack on and off easily with 10 L of liquid in the tank.
The unit worked well and there was no clogging or leakage. The lance is a good length also, so no need to stoop to spray low-growing weeds. Plus, the pump action is easy, and the pressure provided is excellent.
It has an adjustable nozzle that allows you to change from a fine spray to a good jet very easily.
This sprayer is the best knapsack sprayer if you have a lot of spraying to do as you can work for about an hour without having to refill. It is also good value for money given its excellent construction.
Matabi Supergreen 12 Litre Knapsack Sprayer Review
This Matabi Supergreen Knapsack Sprayer has a 12 L capacity making it suitable for large areas. It is comfortable to use, with padded, fully-adjustable straps.
The fibreglass lance is 3.2 m and comes with extensions for different uses. The pressure is also adjustable so you can change it between 1.5 bar, 3 bar and ‘free pressure flow’ to ensure even distribution.
It comes with a nozzle designed for different applications, as well as a conical and rectangular hood – these will protect your adjacent plants when applying weed killers (great news for your prized rose bush!).
I used this sprayer to clear weeds from my drive and found it to be easy and comfortable to use. It produced an even spray, and the length of the lance meant there was no need to stoop down. Considering this is a job that normally leaves me with backache for several days, I was very pleased!
While this model is a bit more expensive than the two previous models, it’s dearer for a reason – this is a serious, semi-professional bit of kit! One issue though is that you can’t see how much liquid is in the tank, so you have to measure any ratios out first.
VOXON 5 Litre Pump Action Garden Knapsack Sprayer Review
This VOXON 5 Litre Pump Action Garden Knapsack Sprayer has a translucent tank bottle with measurement markings, making it easy to see how full the tank is as well as dilute products straight into the tank.
The 5 L capacity isn’t the largest, but it’s more than suitable for small- to medium-size areas and means the unit is never too heavy.
a 5 L capacity and features a lockable trigger mechanism and an adjustable nozzle that offers a range of settings from a fine mist to a spray.
As with the previous products the translucent tank is sturdy and well made and makes it easy to measure chemicals and to fill. The pump is easy to use, and the unit provides an even spray.
This is another good value product suitable for the smaller garden and light use.
Spear & Jackson Pump Action Pressure Sprayer 5 Litre Review
The Spear & Jackson Pump Action Pressure Sprayer has a 5-litre capacity. The sturdy, translucent bottle makes it easy to mix and fill and the shoulder strap makes it easy to carry. The product features a lockable trigger for continuous spraying and the nozzle is adjustable between a fine mist and a single jet. Pumping the unit to create pressure is simple and easy and the spray provided is even.
The shoulder strap is not quite as comfortable as the backpack style products: I found that the unit bumped around a bit on my hip when in use. The lance is also a little on the short side. However, this is a well-built product that looks likely to offer years of use and it comes at a very reasonable price.
This sprayer is excellent value for money, it does the job well with no leaks and would be perfect for occasional, light use. In my opinion it’s the best knapsack sprayer on a budget!
Knapsack Sprayer FAQs
To ensure you get the best out of your sprayer you should clean it thoroughly after every use. This will remove potentially corrosive chemicals from the tank, hose and lance.
You can buy special pump cleaners, alternatively or flush the unit through with clean water. In addition, you should store your unit in a dry, frost free location.
Lubricating the joints and seals can keep them from drying out and cracking. Always remember to check for leaks before filling your sprayer with chemicals.
It is best to spray weeds on a dry day when no rain is forecast. Rain can wash the weed killer away before it has a chance to work. You should also choose a day that is not windy to avoid the weed killer being blown onto adjacent areas and damaging other plants.
It is not recommended that you use the same sprayer for both pesticides and weed killers. This is because, even with thorough cleaning, your sprayer may contain traces of weed killer. This could harm your plants if applied to them alongside pesticide. To be on the safe side, keep a specific sprayer for weed killer and don’t use it for anything else.