Mosquito Dunks 6?s

Didn't work for me but I'm not sure it's the products fault. Maybe these things aren't black flys??? Ended up buying a UV lightHow I rate items:1 star (I hate it!):Would NOT recommend.2 star (I don’t like it): But has some slight redeeming quality.3 star (It’s ok):Others may like it more than me.4 star (I like it): Good product but may have some minor5 star (love it) Perfect

I bought this product and did a test in several 5 gallon buckets. Each of the buckets were full of mosquito larvae. I started the first bucket with a very small amount of dunk, a mid amount in 2nd bucket and a larger amount in the 3rd bucket. The next day the larvae in buckets 2 and 3 were dead. I was impressed however it only lasted a week and a half. After a week and a half larvae were in the buckets again. I will try a different brand of Bacillus. I was hoping it would last nearly 30 days as it indicates on the package.