Total immersion of the grounds in the water results in rapid yet robust extraction of flavor.
Total immersion permits extraction at a moderate temperature, resulting in a smoother brew. Air pressure shortens filtering time to 20 seconds. This avoids the bitterness of long processes such as drip brewing.
The air pressure also gently squeezes the last goodness from the grounds, further enriching the flavor.
Because of the lower temperature and short brew time, the acid level of the brew is much lower than conventional brewers. Laboratory pH testing measured AEROPRESS brew's acid as less than one fifth that of regular drip brew.
The low acid is confirmed by coffee lovers who report that AEROPRESS brew is friendlier to their stomachs.