A quality knapsack sprayer is essential for weed control, fertiliser application, and pest management across lawns, sports pitches, and commercial landscapes. But with tank sizes from 5L to 20L and price points varying wildly, how do you choose the right one?
We've put together this comprehensive buying guide to help you find the best knapsack sprayer for your needs in 2025.
What Size Knapsack Sprayer Do I Need?
15L Knapsack Sprayers
The most popular size for general-purpose use. A 15L sprayer hits the sweet spot between capacity and weight — full, it weighs around 17kg, which is manageable for extended spraying sessions.
Our Premium 15L Knapsack Sprayer features ergonomic straps, UV-protected polyethylene tank, and high-pressure output for consistent, even coverage.
16L Knapsack Sprayers
One litre more than the 15L, but often with upgraded features like internal piston pumps for higher pressure. The Premium 16L Knapsack Sprayer is ideal for professionals who need maximum pressure for herbicide and fungicide application.
20L Knapsack Sprayers
For large areas where minimising refill stops matters, a 20L sprayer is the professional choice. Our Premium 20L Knapsack Sprayer covers significantly more ground per fill — essential for commercial grounds teams.
Electric Sprayers
Tired of pumping? The Electric Sprayer 15L with Lithium-Ion Battery eliminates manual pumping entirely, delivering consistent pressure throughout the tank. Perfect for operators with shoulder or wrist issues, or anyone covering large areas daily.
Manual vs Electric: Which is Better?
| Feature | Manual Pump | Electric Battery |
|---|---|---|
| Price | £40–£80 | £80–£150 |
| Weight (empty) | 3–4kg | 4–5kg |
| Pressure consistency | Drops as tank empties | Constant throughout |
| Maintenance | Seals & gaskets | Battery care + seals |
| Best for | Smaller areas, budgets | Large areas, daily use |
What Can You Spray with a Knapsack?
- Herbicides: Selective and non-selective weed killers — browse our Weed Control range
- Fertilisers: Liquid feed applications — see our Fertilisers collection
- Fungicides: Turf disease treatment
- Insecticides: Our High-Performance Insecticide Solution is ideal for caterpillar and pest control
- Water: Spot watering transplants and seedbeds
Essential Sprayer Accessories
Extend your sprayer's versatility with the right attachments:
- Premium 1m Lance with Elbow — reach under hedges and into awkward spots
- Premium 13mm Drill Bit — for applying stump killer via stem injection
- Professional Stem Injection Kit — precision application for invasive species control
Sprayer Maintenance Tips
- Flush after every use — run clean water through the entire system
- Check seals regularly — replace at the first sign of leaking
- Store indoors — UV and frost damage shorten tank life
- Clean nozzles — a blocked nozzle gives uneven coverage and wastes chemical
Browse our complete Spraying Equipment collection with 39 professional sprayers, lances, and accessories. Contact us if you need help choosing the right sprayer for your operation.