NOVELTY - Closed loop compost tea brewing system (10) (s1) comprises: hydroponic reservoir (14) to hold fluid, where the reservoir includes inlet and outlet; compost tea brewing assembly (12) configured to brew compost tea, where the assembly includes tea brewing reservoir (16) containing compost and is dimensioned to hold quantity of fluid; pump configured to recirculate liquid from outlet of hydroponic reservoir into inlet of hydroponic reservoir; and level switch associated with tea brewing reservoir configured to control actuation of pump to prevent fluid level from rising above predetermined level.    USE - The systems are useful for supplying a nutrient-enhanced liquid to the plants.    ADVANTAGE - The system: allows nutrients in the tea brewing reservoir to be gradually released to the hydroponic reservoir, which provides nutrients to the hydroponic reservoir all of stages of compost decomposition; provides optimum growth to the plants; conserves nutrients used during growth cycle; and utilizes compost tea brewing assembly that allows mobility.    DETAILED DESCRIPTION - Closed loop compost tea brewing system (10) (s1) comprises: a hydroponic reservoir (14) dimensioned to hold a quantity of fluid, where the hydroponic reservoir includes an inlet and an outlet; a compost tea brewing assembly (12) configured to brew compost tea, where the assembly includes a tea brewing reservoir (16) containing a quantity of compost and is dimensioned to hold a quantity of fluid and has an inlet and an outlet, the outlet of the reservoir is fluidly connected to the inlet of the hydroponic reservoir, the inlet of the reservoir is fluidly connected to the outlet of the hydroponic reservoir, and the fluid connection of the outlet of the hydroponic reservoir is a direct fluid connection to the inlet of the tea brewing reservoir without any intervening operating structures; at least one pump configured to recirculate liquid from the outlet of the hydroponic reservoir into the inlet of the tea brewing reservoir; and a level switch associated with the tea brewing reservoir configured to control actuation of the at least the one pump to prevent a fluid level within the tea brewing reservoir from rising above a predetermined level. The pump and level switch operate together to continuously recirculate fluid between the hydroponic reservoir and the tea brewing reservoir. INDEPENDENT CLAIMS are also included for:    (1) a closed loop compost tea brewing system (s2) comprising the hydroponic reservoir, the compost tea brewing assembly configured to brew compost tea, a closed loop arrangement fluidly connecting the tea brewing reservoir and the hydroponic reservoir, where the closed loop arrangement is configured to provide continuous fluid flow directly from the tea brewing reservoir to the hydroponic reservoir and recirculate fluid from the hydroponic reservoir directly back to the tea brewing reservoir, pump configured to recirculate liquid from the hydroponic reservoir to the tea brewing reservoir, and level switch associated with the tea brewing reservoir configured to control actuation of the at least the one pump to prevent a fluid level within the tea brewing reservoir from rising above a predetermined level; and    (2) a closed loop compost tea brewing system (s3) comprising the compost tea brewing assembly configured to brew compost tea, where the compost tea brewer assembly includes a tea brewing reservoir containing a quantity of compost, the tea brewing reservoir has an inlet and an outlet, a hydroponic feed system having an inlet and an outlet, where the inlet of the hydroponic feed system is in fluid communication with the outlet of the tea brewing reservoir to supply compost tea to the hydroponic feed system, the outlet of the hydroponic feed system is in fluid communication with the inlet of the tea brewing reservoir to recirculate fluid from the hydroponic feed system to the tea brewing assembly, the fluid communication between the outlet of the tea brewing reservoir and the inlet of the hydroponic feed system is a direct connection, and the fluid communication between the outlet of the hydroponic feed system and the inlet of the tea brewing reservoir is a direct connection, pump configured to recirculate liquid from the hydroponic feed system to the tea brewing reservoir, and a level switch associated with the tea brewing reservoir configured to control actuation of the at least the pump to prevent a fluid level within the tea brewing reservoir from rising above a predetermined level, where the pump and the level switch operate together to continuously recirculate fluid between the hydroponic feed system and the tea brewing reservoir.    DESCRIPTION OF DRAWING(S) - The figure shows a diagrammatic view of the closed loop compost tea brewing system.    Compost tea brewing system (10)    Compost tea brewing assembly (12)    Hydroponic reservoir (14)    Tea brewing reservoir (16)    Port (18)