The HomeBrewStuff ULTIMATE Stir Starter Kit with Aeration system - choose flask size Here's a brewing kit that will make your good beers better. Many home brewers don't pitch nearly enough yeast. And some homebrewers just want to breed enough yeast for more than 5 gallons of beer. And still some are looking to reuse and breed their own strain of yeast. This kit helps you culture the highest cell count and healthy yeast for quicker fermentations, lower risk of infections and better tasting beer. All this in less time than it takes to make a conventional yeast starter. This unit has two powerful NdFeB button magnets in the 12 VDC stir motor, which is controlled by a precision voltage regulator for easy speed adjustment. The RPMs of the drive motor are limited, so the motor will not "throw" the stir bar, yet it provides enough to get a good vortex going. A low voltage, plug-in wall transformer provides power to the unit. The black plastic case dimensions are 6" x 4" x 2", large enough to accommodate the 2000 ml flask. A Teflon coated 1" x 5/16" stir bar is included. A "keeper" magnet is also supplied to lock the stir bar in place while the yeast is pitched, so the stir bar won't end up in your fermenter! Stir plate comes with a lifetime warranty! The ULTIMATE kit comes with a Wort Aeration System! This kit offers an easy way to effectively aerate your wort without having to buy disposable oxygen tanks. The inline Hepa-filter blocks airborne bacteria and contaminates from entering your beer, and the Stainless steel diffusion stone disperses the oxygen into your wort for rapid uptake by the yeast. Everything you need is included to aerate batch after batch. YOU CAN ALSO USE THIS STONE FOR CARBONATING! Attach 2' of 1/4" tubing from the "gas in" dip tube inside the keg. (Tubing not included). You set your desired pressure on the regulator and gas gets emitted through the 2 micron stainless stone. The half micron bubbles rise through the beer creating so much surface area contact between gas and liquid that the absorption rate is very rapid. This is very similar to how beer is carbonated in breweries. Includes: Electric Air Pump - Inline Air Filter - Stainless Steel Diffusion Stone - 4' of 1/4" ID Tubing Complete kit comes with: Your choice of 500ml, 1000ml, or 2000ml Erlenmeyer flask Wort Aeration System Rubber stopper and 3 piece airlock 1 lb. Golden Light dry malt 4 oz Fermax Yeast Nutrient Stir Plate w/ magnetic stir bar and starter instructions - lifetime warranty!