Abstract: A brewing system for fermenting beer when isolated from any possible micro-biological contamination comprises a first holding frame in a fermentation tank, a second holding frame in a bright beer tank, a water supply subsystem that is effective to measure, filter, and expose incoming water to UV light, a mixing subsystem that is effective to connect fittings or glands clamped onto manifolds of the fermentation and bright beer tanks, and aseptic dry, sealed bags containing dry ingredients of powdered malt extract, beer mixes, hops, and yeast. The brewing system includes a valve for connecting the water supply subsystem to the fermentation tank, and a mechanism for transferring the powdered malt into a disposable second aseptic dry, sealed fermenter bag for fermentation in the fermentation tank to form fermented beer. The disposable fermenter bag has ports on a bottom manifold and is designed to fit into the first holding frame that is insulated and custom controls its temperature.