Just as it sounds, compost tea in simple terms is compost that is soaked in a water which produces a rich liquid fertiliser for plant or crop feeding.
To kick start the process a catalyst is added to ‘wake up’ the micro-organisms in the compost and encourages them to multiply. Once the catalyst has been added, the compost is aerated and mixed for several hours. After a few days the aeration and mixing is stopped and the compost is left to settle out and the liquid (or compost tea) is then drained off.