The idea behind compost tea is that compost is added to water, and then oxygenated air is cycled through the mixture to both stir and aerate. The air that is cycled through the mixture, allowing the beneficial fungi and bacteria to multiply at a much higher rate than if left in the compost pile.
The liquid created in this process is full of billions of beneficial organisms; among them are the aforementioned bacteria and fungi, along with organisms like nematodes and protozoa, all beneficial to plant growth and protection from plant disease.
Compost Tea can be used as a completely organic fertilizer. Commercial fertilizers still have to be broken down by soil to be effective. Water runoff can limit its effectiveness. Plus, commercial fertilizers generally contain non organic chemicals. Compost tea is an organic alternative to these harsh chemical fertilizers.
Compost tea can make your compost go farther. Once the liquid is extracted and used, the original compost used to make the tea still has plenty of beneficial compounds. This compost can be put back into the compost pile, or can be spread in the garden.
When strained properly, Compost tea can be put in a dispenser, and then sprayed directly on plants, including the on the actual leaves. When sprayed directly on the plant, it can help leaves to stay disease free and fight future infection.
Compost tea, whether strained or unstrained can be applied at the base of the plant. This injects nutrient rich liquid directly to the root system where it can be most beneficial. This is especially effective for starting young seedlings, giving them a strong nutrient base for successful growth.