Bottling plants should be insect free. The most efficient way of doing this is to install an electrocutor. However, careful thought should be given to the design of the equipment and the siting of the device.
When an insect flies into the electrocuter it literally causes the insect to explode. Unfortunately this creates a lot of debris which can easily fly out into the bottling plant. Look out for designs that minimise excessive spatter-back when the insect is killed.
The unit should not be in the vicinity of the filling section otherwise debris may cause contamination during filling. The design of electrocutors has not changed very much over the years but non-electric systems are available. These use glueboard technology and UV lamps. The insect literally sticks to the glueboard without exploding.
Another aspect is the lifetime of the UV lamps. The power of the UV light is not constant during use and will tail off after several months becoming less effective. This is not noticeable to the human eye. Ensure that the elements are changed at the correct time and service from the supplier is undertaken regularly.