Once growers are certain that the machine they have is capable of extracting the organisms, and will allow those organisms to survive (e.g., the tea stays aerobic), then the additives need to be assessed. Commercial machines should have data for their machines, and the grower should be able to achieve good results (e.g., good active bacteria, active fungi, total bacteria and total fungi) the very first time they use a commercial tea brewer with its nutrient starter mix.