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Pest Expert Formula 'C+' Cluster Fly Killer 5L

Our Price: £29.15 excl. VAT
Our Price: £34.98 incl. VAT

Pest Expert Formula 'C' is a highly effective cluster fly killer with an excellent knockdown. The active ingredient, cypermethrin (0.1% w/w), is a professional-strength insecticide, which gives Formula 'C' its fast-acting formulation and long-lasting effect.

Ideal for elimination of cluster flies in lofts, roof spaces and other areas, Formula 'C' kills cluster flies on contact and leaves an invisible residue which remains effective for up to 3-4 weeks, helping maintain cluster fly control.

Formula 'C' can be applied to roof timbers and other alighting surfaces, including windows and window frames. Water-based and low odour, it is perfectly safe for use in homes with children and/or pets as long as packaging guidelines are adhered to.

Formula 'C' is a broad spectrum insecticidal surface spray, which can also be used for the control of many other insect pests including moths, ants, cockroaches, and fleas.

A 5L container will typically treat an area of approx 100 square metres.

To achieve a thorough and more professional application, we recommend purchasing one of our Pressure Sprayers.

Pest Expert Formula 'C' Cluster Fly Killer 5L
Qty From Qty To Unit Price
1 £29.15
2 5 £27.50
6 £24.95
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Customer Reviews

Write an online review and share your thoughts with other shoppers!

Yvonne-Manchester-5 Stars

Kills flies very quickly.

Renee-Windsor-5 Stars

Perfect for the space I needed. Great for treating large rooms.

O. Pearce-Kent-5 Stars

Having converted our a barn in the last year, this was the first year we have experienced anything like this, despite being in the country. The order was processed and sent very quickly and more importantly - it works well!

Jessica-Glasgow-5 Stars

The delivery was so prompt and the container has all of the information required on the back. This insecticide has been very effective so overall I am a satisfied customer

Kim-Cheshire-5 Stars

We have had a nightmare recently with flies in our loft and them coming through the spotlights into the bedrooms and bathrooms. I then applied this spray to all surfaces and windows in the affected rooms and now I only have to hoover them up rather than killing them as and when they enter. This has honestly saved me so much time and worry because it really isn't a pleasant thing to have to deal with.

Raymond-Worcester-5 Stars

Ordered one day and it arrived the next day. Couldn't ask for better service.

David Chadwick-Kirkby-In-Cleveland-5 Stars

I purchased a starter kit in Spring and that got rid of the cluster fly problem in the summerhouse that I have suffered for over 2 years. I was so impressed I decided to order 5 litres of Formula C and prevent the buggers from hibernating in the summerhouse over winter. Delivery was prompt and I was able to spray the roof and rafters straight away. So far a few flies have made it into the summerhouse but are obviously poisoned and drop to the floor. I no longer faces thousands of flies filling the summerhouse whenever we have a fine day. I'd recommend this to any one.

Ian Jones-Bolton-5 Stars

Good prices, excellent communication, goods delivered promptly - I will deal with this company again - but hope I don't need to!!

Malcolm-Wetherby-5 Stars

I needed a fast solution to a potential cluster fly issue and this company provided a range of affordable options that were easy to use. After the fast delivery of my goods, I had further questions that the help desk was able efficiently deal with. I would not hesitate to use them again - thanks!

Would recommend this company to everyone

Raymond-Worcester-5 Stars

Fly Spray Flies From Clusterflies

Ordered one day and it arrived the next day. Couldn't ask for better service.

Peter Jones-New Milton-5 Stars

Saved a fortune!

Last year I paid £320 to a local pest control firm to visit twice and set off a combination of Pest Expert smoke bombs and foggers in my loft (literally a 10 minute job). Now I do it myself, buying products here for around £75! Excellent company with high quality, easy to use products. Highly recommended!

David Chadwick-Kirkby-in-Cleveland-5 Stars

Speedy response on target

I purchased a starter kit in Spring and that got rid of the cluster fly problem in the summerhouse that I have suffered for over 2 years. I was so impressed I decided to order 5 litres of Formula C and prevent the buggers from hibernating in the summerhouse over winter. Delivery was prompt and I was able to spray the roof and rafters straight away. So far a few flies have made it into the summerhouse but are obviously poisoned and drop to the floor. I no longer faces thousands of flies filling the summerhouse whenever we have a fine day. I'd recommend this to any one.

Charles Elliott-Leyburn-5 Stars

Cluster Fly Annihilation!

I have used this company for the last 3 years (when the flies arrive each Autumn) and I can confirm that both their products and service are excellent. The Pest Expert Formula P Foggers are my preferred method, they're easy to use and deliver devastating results!

Ian Jones-Bolton-5 Stars

Superb service

Good prices, excellent communication, goods delivered promptly - I will deal with this company again - but hope I don't need to!!

John-Saltash-5 Stars

Spraying Formula C on the alighting surfaces certainly seems effective, I have purchased a five litre can ready for next year!

Lynda-Ledbury (Herefordshire)-5 Stars

Quick delivery and the spray seemed to do the trick. All in all, very pleased.

Excellent service

Nigel-Newport-5 Stars

Smoke bombs were unbelievably efficient. They dropped like black snow.

Ian-Dorchester-5 Stars

Clear website, Fast delivery on day promised. No compalints

Mark-Cullompton-5 Stars

would highly recommend this product if you are having problems with infestations of cluster flies. These products resolve the problem and deters the flies from returning in the future. Very quick delivery, very professional company.

Brilliant!

David-Abberley (Worcester)-4 Stars

This product was bought on the strong recommendation of a friend, who was (and now ISN'T) pestered by pesky Clusterflies. We haven't used the product yet because this is happening in France - but I'm sure the results will be the same, our houses are very similar. We're just waiting for our next trip to France! So this is an anticipated rating. PS. Delivery etc fine - just a slightly damaged packaging from handling in the mail.

Fast service, good price, goods arrive when promised

Lesley-Canterbury-5 Stars

Since moving into our house 8 years ago we were troubled with flies in the loft but Clusterflies solved our problem with use of spray and smoke bombs. We like to keep some smoke bombs handy should we need them at a future time.

Very good service

Susan-Wrexham (North Wales)-5 Stars

Ordered cluster fly pack after looking at all the reviews . Arrived very quickly , well packaged with clear instructions and v useful face mask ! Did the job ! Would use again .

Excellent service for an excellent product