On another thread I was sharing fly control strategies and thought I would share some here. It is easier to control flies when you have more devices working. I purchase these from Walmart for about $5. When they get filled I remove the one way trap device and place on a clear juice jug. Clear works better than opaque since the flies can see into. All their relatives are enjoying the spoils.

. It is similar to this one but better. I believe the flies can escape from this one. Mine is more like Fort Knox.
View attachment 1111667 This is the original store version.
This is my home edited version.
View attachment 1111673
I keep reusing when bottle gets about half. I just save some of the fly juice as starting attractant, and add more water. I keep about 5 or 6 in different locations and my fly problem is under control.