Pest ExpertCluster Fly Killer Smoke Bombs 4 x 3.5g - Formula 'P' Fumer Cluster Fly Bomb (HSE approved and tested – professional strength product)

verry good

Fantastic, would highly recommend. Unfortunately, the second lot of two didn’t light or smoke and couldn’t be re lit. Have emailed customer service. Kills the majority of loft cluster flies with just two. Two more probably needed to kill the rest.

Cluster flies are a nuisance (these are nothing to do with house flies and are no indicator of hygiene or cleanliness) which gather in cracks in the ceiling beams of old houses and swarm when you put the heating on. However, one application of these smoke bombs and they (literally thousands of them) dropped down dead as if from nowhere.

Paid £80 last year for cluster fly treatment, that was with £10 off as my neighbour had the treatment too. I was told they could come back each year which they did, fortunately not as many. I set two smoke bombs off on a cooking tray in the loft and went out. When I came back I just had a quick Look and couldn’t see any of the flies, want to leave in 24 hours before going in properly but I’d say it’s been very effective.I wasn’t sure what to expect but the smoke just rises steadily and fills the air, no sparks or anything crazy. Bit like incense smoke but more intense. I’d say it’s a brilliant product as it’s cost around £7.50 to treat. You get a piece of paper included which tells you how much to use for the size of the area that needs treating and also for what pest you are trying to exterminate

Easy to use does to produce lots of dense smoke. I used in my loft after I found cluster flies one day in summer. Lit three of them on a silver tray and left for couple of days. Killed about 90% of the flies. This year I will set off three early summer to fumigate the loft. Top tip don't use on a windy day if yo have a breezy loft.

We have purchased these bombs three times as have been having a real problem with cluster flies in the loft. We had been having some success in eradicating them by using these bombs, but with the last purchase 2 of the 4 bombs were faulty. They initially lit, but went out after a few seconds (once the touch paper had burnt) but then they failed to give off any odour - they were completely dead - not smoking, smouldering or giving off any gas/smoke.As we have used these bombs 8 times previously, we know what to expect from them. When we contacted the company to express the issues, they requested photos. After they received the photos they refused to believe that the bombs were faulty, and fobbed us off with jargon.They should learn to take the customer’s word for it - especially when we have used them 8 times before! They need to appreciate that not all their products are infallible, and indeed there are plenty of other companies on the market that sell the same products, of which we will be using going forward.

I personally found they work perfectly. I used two of the cannisters in my loftspace, left it overnight and no more cluster flies (so far) Job done!

Definitely worked but having to buy another 4 to finish the job as there were still a few flies left. We have quite a sizeable loft so I lit all four spaced out equally. They let off quite a lot of smoke as I was exiting. left overnight and there were certainly lots of dead flies but some survived (saw a dozen of so) which I didn't expect. lets see if the second round finishes the job. will leave the light on to hopefully draw the few left towards the light and set a couple off in that area.