Use this stainless steel stone to aerate chilled wort prior to fermentation. After removing hot break out the bottom port once wort is chilled, simply sanitize the stone and bottom valve on the 3-in-1, then attach the stone and open the valve. Oxygen will pass through the 2 micron pores and diffuse into the wort.
Recommended aeration period is about 1 minute for 20L/5gal batches at a flow rate of about 1L/minute. Gas flow meters can be installed inline that allow you to calculate the flow rate and can be purchased at the gas supply store along with a tank of O2 and regulator. Dissolved oxygen meters can also be purchased that can determine if the wort has reached the desired 8-10ppm of O2.
An aquarium pump (a powerful commercial one is needed to overcome the head pressure) can be used but an inline filter is recommended to scrub out dust and microbes. When using air, the flow rate or duration should be about 5 times longer than with pure oxygen as air is only about 1/5 oxygen. A compressor could also be used, but be sure one is used that will not put oil or other contaminants into the wort.
Touching the stone is not recommended as oils can plug the tiny pores. The stone can be cleaned or sanitized by boiling in water. The stone fits to 1.5" tri-clamp ferrules and has a 1/4" hose barb.
Note: Some assembly required. Teflon plumbing tape should be snugly wrapped seven revolutions in a clockwise direction around the pipe thread on the stone, then the stone screwed into the coupling. If it still leaks when snugly tightened, a little food safe teflon pipe dope can be applied to the threads before wrapping with teflon tape.