Karlsten Bed Bug Killer Spray, 500ml - Fast Acting Spray, Strong Killer, Kills on Contact,for Mattress Repellent protection Kills On Contact

I can’t rate this product highly enough and am so surprised that there are quite a lot or reviews that say it doesn’t work. We have just moved into a house with a major false widow spider issue in the conservatory. There is a batton that runs along the whole width of the room that you can’t get behind and it appeared to be full of false widows. They would come out to eat on their webs but you could never kill one as they’d just disappear behind the batton. I’d wreck the webs thinking they’d move on but they’d just rebuild overnight. I have a major fear of spiders, especially false widows as they bite, so said to my husband we need to tackle this head on and buy a killer spray! This spray had loads of reviews so thought I’d give this a go although did feel it pricy at £13.99 but I was so desperate to get rid of the spiders I bought it. Well, no more false widows anywhere so as far as I’m concerned it has been worth every penny - all the webs were empty of spiders the following day (I kept checking) and before I cleaned the webs away, the webs had bugs in them which clearly weren’t being eaten so proof to me it had worked as I was seeing the spiders move onto the webs daily to eat previously. We then had one really huge false widow elsewhere (I didn’t know they could get so big) and hubbie sprayed that directly - it didn’t die instantly but it forced it out of its hiding place and whilst I could tell it was dying I killed it with a fly swat just to be on the safe side. The spray worked immediately on smaller ones nearby that I didn’t even know were there. The huge added bonus about this spray however is that it’s also killing flies and wasps that happen to fly into the conservatory - we aren’t spraying them - there’s obviously residue spray in the room from spider gate and that’s killing the flying unwelcome guests too so the statement that it works for up to 6 weeks does appear to be true. If we get a butterfly or bumble bee in we are carefully catching that and releasing it as I do suspect it would kill those too which we don’t want. Anyway, couldn’t be happier with this product. It is a shame it is released as a liquid as we do have to wipe up the excess after spraying - an atomised spray (that comes out like furniture polish spray) would be much better in my opinion and easier to spray in a targeted fashion - the liquid comes out with a very wide spread too and sometimes you just want a direct shot on one bug rather than a sweeping cover. It doesn’t have a nasty or lingering smell and I’m reassured by the safety statements on the listing too - I don’t like the idea of spraying nasty chemicals around my son especially when they appear to kills things for weeks after spraying but it says tested as safe for use in homes so I have to rely on that and was a big part of why I felt happy to try it in the first place. If the false widows didn’t give such nasty bites we’d let them be but they do so we don’t and thanks to this product we are false widow free now! We will continue to spray as a preventative measure every 5-6 weeks as the lasting impact of this spray will help keep them out of the house.

After extensive research on bed bug treatments, I can confidently say that the effectiveness of any product depends on your preparation. Simply spraying a little on your mattress won’t cut it—you need to remove all clothes from cupboards, spray inside them, treat cracks in the floor, the entire mattress, and all parts of the bed frame. However, the bugs can be hiding anywhere and are attracted to the carbon dioxide, so just because you don't see them, doesn't mean they are gone. The pests can hibernate for 6 months without food so it is a pain. This Bed Bug Spray does kill on contact and provides some lasting protection, but if you have a heavy infestation, one bottle won’t be enough. In my case, I had a smaller bedroom with a single bed that was heavily infested, and even with professional-grade treatments like Provecta, C40 WP, and Cimetrol RFU, it still took several applications over multiple visits to fully resolve the issue. While this is a good starting point for minor infestations or preventative treatment, you’ll need several bottles for anything more serious. By the time you buy multiple bottles, you might be better off investing in professional treatment. That’s the main reason I’m giving this 4 stars instead of 5—it works, but it’s pricey for the amount you’ll likely need. Overall, a good product, but be prepared to invest in multiple applications for best results. I also contacted the helpdesk to confirm I could spray this on the mattress and they confirmed, their customer support was very responsive and helpful.

This spider killer works really well

It doesn’t kill giant spider’s immediately but it will eventually. It makes them uncomfortable enough to move so you can catch them and put them outside. Have sprayed under floor vents and potential entrances from outside. Have reduced giant spiders to nothing within 10 days. Before using this spray I had maybe four giant spiders in the house scurrying across the living room floor and kitchen ceiling each night. After spraying entrance zones inc doorways, wall vents and room corners, after a few days the spiders disappeared. I think for large spiders this spray is a huge deterrent rather than something that kills them. I personally do not like killing spiders and before this spray, I tried to remove each spider but this wasn’t effective. Highly recommend spray. Allow a few days for results.

Sprayed it directly on a spider and saw it die, the product itself is good. But the bottle is very defective. The spray nozzle wasn’t working even though it was “open” nothing would come out for a while. Not to mention Yoon that it drips a lot while spraying

Our spiders treat it like perfume. It doesn’t kill them right away even after 10 sprays, the spider took forever to die, like Tony Montana.

It seems to be working, so definitely will buy again and definitely recommend

This does not instantly kill spiders . It appears to be a nerve agent that cause muscular contractions. Spiders therefore cannot operate for very long on the sprayed area without being disabled. I also think that it has deterrent properties because this summer there are no spider webs on my balcony outside . This absolutely is a win. This is mid July and I also notice there are nearly zero flies and midges on the balcony. Given that my balcony is outside and also subject to rainfall this chemical still works nonetheless. I have a colony of false widow spiders on the balcony which are seriously dangerous . This chemical has wiped out their operations . If you see a spider on the area you have sprayed it wont last long . I note from the reviews that some people dont realise you have to twist the block at the tip of the nozzle to open the spray . The product details says it lasts 6 weeks and this is what I have found. I use about 30% of the bottle on the first spray and use 2 bottles each summer season .