I was so excited to purchase this after reading the reviews.  I am sad to say it did not catch much.  After about a month, it caught 3 flies maybe.  I put it near our chicken coop, filled it with water half way and I will say I did not use the packet they sent.  I could not bring myself to deal with the foul smell and nastiness and I was hoping to be able to reuse this  trap and give the dead flies to the chickens and I knew I could not do that if I used the  stuff they sent.  Unfortunately,  it did not work without the packet of nasty smell.  I thought it was a little over priced for what you get.  Ultimately this is just a plastic bottle with a lid.