Fly Trap & European Wasp Catcher by Envirosafe.
This trap uses a revolutionary, non-toxic attractant that is irresistable to flies. It is totally pesticide free, vey economical yet very effective and easy to use.
For use with Envirosafe Fly Attractants. One sachet of attractant supplied with the trap. refills available.
To set it up, you simply empty the contents of the sachet (a dry loose sandy sort of mix) into the empty trap and add half a cup of water. It takes about a day to start working, and remains effective for 2 - 3 weeks.
When it is full, or when it has stopped working, empty the dead insects out - into the compost or dig a hole in the ground and bury them - and reset the trap with a refill sachet of attractant.