Smoke Bombs are back! Well, in fact they never went away, but the chemical used has changed and is now 13.5% Permethrin.
They are basically a small pyrotechnic that produces toxic smoke, as well as killing any spider mite that may be crawling around in your growing area between cycles they also kill adult thrip that are normally impossible to eradicate.
Each fogger does 7.5 cubic metres. To work out how many you will need, simply multiply the dimensions of your growroom together to get the metres cubed; for example - 3m x 2m x 2.5m = 15 metres cubed, you will need to use two foggers to effectively kill everything in the area dead.