Still water stagnates. Flowing water stays fresh and clear. When water moves around, a bunch of great things happen. Here's how aeration works in our drinking water:
The aeration process detoxifies and improves the taste and quality of almost any water. Tap water, filtered or distilled water … adding oxygen to drinking water positively influences the physical and chemical characteristics of drinking water.
The swirling motion increases gas transfer between the atmosphere and the entire body of water, introduces fresh air, enriching and replenishing dissolved oxygen into the water.
Volatile Compounds Out
The increase gas transfer, increase the evaporation and release of volatile compounds from the water. Volatile Organic Compounds (VOCs) such as MTBE, toluene, trichloroethylene, benzene and many other harmful organics.
Raise pH level
Aeration increases pH levels by a bit making the purified water less acidic.
Improve taste and odor
This aeration removes many tastes and odors from water. These may be dissolved gases or volatile organic molecules.
To read more about the aeration process in drinking water, go here.