The air we breathe is far from ideal for producing compressed air. It is a fairly constant mixture of 16 different gases. Nitrogen and oxygen are the main components, but it also contains hydrogen, carbon dioxide, carbon monoxide, and a small share of noble gases. Therefore, it is necessary to filter the air to achieve higher compressed air quality.
The compressed air is directed against the wall of the filter housing, causing the turbulent air to separate approximately 95% of oil and water droplets and large particles, which then collect at the bottom of the cup. Water vapour can pass through almost unhindered. The moisture collected at the bottom of the cup is discharged when the (automatic) float opens the outlet.
The application defines the required compressed air quality. Compressed air for a whipped dessert is not the same as for a demolition hammer. The method of air generation can influence quality, but almost by definition every compressor delivers unusable compressed air. Compressed air must be brought to the correct quality standard by drying and filtering.

Perfect Compressed Air