Ok tanks for the reply. Last grows was from clones I got and I was swarmed in gnats from the plants I got. I managed in the end by watering from the bottom and keep the top layer dryer, took me long enough though.

Zero gnats is much better!

Any suggestion to temperature to kill them off in the soil I buy? My grow is seperate from all other plants and stuff and it is winter outside so I should have a fair chance to keep them away if I get clean soil.