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🛡️ Sleep tight, bed bugs fight — for 3 months straight!
Karlsten Bed Bug Killer Spray is a professional-grade, HSE-registered pesticide designed to eliminate even resistant bed bugs and their eggs. With a powerful 5L volume and a residual effect lasting up to 3 months, it offers long-lasting protection when applied directly to mattresses. Trusted across UK homes and dorms, this cypermethrin-based spray ensures effective pest control while adhering to strict safety standards.









| Active Ingredients | Cypermethrin |
| Asin | B08LYJF8LY |
| Best Sellers Rank | 8,934 in Garden (See Top 100 in Garden) 115 in Bed Bug, Flea & Mite Control |
| Brand Name | Karlsten |
| Country Of Origin | United Kingdom |
| Customer Reviews | 4.0 4.0 out of 5 stars (380) 4.0 out of 5 stars |
| Item Form | Spray |
| Liquid Volume | 5000 Millilitres |
| Manufacturer | lodi |
| Specification Met | HSE 10668 |
| Target Species | Bed Bugs Eggs |
| Unit Count | 5000.0 millilitre |
User
Effectiveness
Awesome
User
Bug killer
Fantastic job honestly
User
seems effective. Smell is ok too. value for rmoney
so far so good. bought as replacement/refill for smaller spray. seems effective. Smell is ok too. value for rmoney
User
Kills them when soaked. Otherwise not so much.
This does kill bed bugs.But the claims are not accurate to our experience.It does not kill them on contact.You spray them they run off.You soak them they die.I thought, maybe, they just took time to die. But some were running around 30+ seconds after being sprayed.Soak them and they die within seconds (2-5 depending on size).There is no lasting effectiveness!Once dry they are unaffected by it.I ran multiple tests capturing them and exposing them to different levels of dryness.The results are clear.Effective when in a liquid state.Ineffective when dry.They run over dry like it doesn't exist.It has to cover their body, or get in their respiratory system, by the looks of it.If they had any form of society then today would go down in their history as the great massacre.
User
Ok
Ok
User
Don’t be under the illusion that this product works
We’ve bought this bedbugs spray and we can almost guarantee that it has only 3% chances of killing bedbugs, when found we’ve directly sprayed them and 10mins later they are still running around freely as if we didn’t spray them. You have to drench them only then you might get some soft off result. We found that this other product called bedbug killer killed with on spray when sighted however this product not effective at all, big disappointment. Smell there’s no smell value for money no worth it at all. But easy to use
User
Good product
Did the work I wanted it to
User
Amazing
I keeping waking up with bits every day maybe 6 a day after starting at a hotel I couldn’t find anything in my bed but I couldn’t live waking up every day for more I was going to pay for a exterminator but thought I’d give this a go first I hovered and cleaned my bedroom sprayed this it’s been 6 weeks and not one bite since I would of payed hundred s Thank you for saving me
Trustpilot
4 days ago
2 weeks ago