Firstly all rabbits must be driven into their warrens and all holes must be accessible to be gassed and blocked. Any left open will greatly reduce the effectiveness of the procedure.
The gas tablets are administered by a hand held dispenser into each burrow, which is then sealed normally with a few spadefuls of soil and turf. The moisture in the ground allows the tablet to release its gasses.
Each location has a full risk assessment carried out and all other options are presented to the client with gas being the method of last resort. Often proximity to water systems, public access and high risk to non-target species such as slow worms and Polecats prohibits its use.
Since November 2016 the rules have changed dramatically, for further information please contact Ken.