Cheap, clean and efficient way to insure properly aerated wort.
Comes with air pump rated for continuous use, a 2 micron stainless steel
difusion stone, instructions and all the necessary tubing.
Also inclues a sanitary inline HEPA filter to scrub out any unwanteds out of the air.

Simple to use. Sanitize your stone in boiling water (Careful not to get the filter wet, it will ruin it)
Insert stone down to the bottom of your fermenter and plug in your pump.
Allow to run for about 45 minutes for average gravity home brew, up to 2 hours for higher gravity beer.
  (If excessive foaming occurs, simply shut off the pump, wait a few minutes and start again)
After aeration, pull the rig out of your fermenter and install your airlock.
Resanitize your stone in the boiling water, allow to air dry and store in a clean dry location.

That's it, now you can expect faster starts, healthier yeast, faster and more complete fermentations.