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.
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