Why aerate your wort? Yeast needs oxygen to reproduce and produce strong
cell walls. If the cell walls are weak, the yeast will have a low tolerance for
alcohol, and can die before fully fermenting out the wort. Particularly in worts
with starting gravities in excess of 1.050, this can contribute to long lag
times, slow ferments, and higher than normal finishing gravities. Like an air
stone in a fish tank provides oxygen for fish to breathe, wort aeration provides
needed oxygen for yeast respiration and growth.
How can I aerate wort? Wort can be aerated by simply splashing it into the fermenter when transferring from the boiling pot, or by the use of a Siphon Spray Aerator. Both of these methods, although easy, only saturate the wort to about 30 - 40% of its oxygen-retaining potential. Injecting sterile filtered air with a fine 2 micron air stone for 5 minutes will saturate the wort to approximately 80% of its oxygen holding capacity, insuring the best possible start for your yeast.
We have developed a simple, easy to clean system that includes a .2 micron HEPA in-line air filter, tubing, and a sintered stainless steel 2 micron air stone on a 22” stainless steel wand. The 22” wand lets you position the stone where you want it, without worrying about it floating up during aeration. All components were developed to perfectly fit standard aquarium air pump tubing, and can be quickly detached for cleaning.
The large (50mm diameter) HEPA air filter is rated at
120 hours of use before clogging, and will last for several hundred uses with
proper care. The 2 micron stainless steel air stone is 1/2” wide by 1” long, and
is permanently attached to a 22” stainless stem. Includes 4’ of tubing, a 22”
air wand, the in-line 2 micron filter, and instructions. Needed aquarium pump
is not included, we recommend buying an inexpensive model ($6.00 to $9.00) at a