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Dissolved Air Flotation (DAF) is a process that clarifies liquids by releasing tiny bubbles that stick to and float suspended matter. The bubbles adhere to the suspended matter causing it to float to the surface and form a layer of float material which can then be removed. Collection of float material may be achieved hydraulically through simple overflow or by mechanically skimming it into a collection channel. The clarified liquid exits from the bottom of the DAF clarifier.

DAF systems currently treat liquids ranging from drinking water to the industrial waste streams of chemical plants and petroleum refineries.

DAF systems with loading rates greater than 6 gpm per square foot of DAF clarifier area are considered in this project to be "high rate". As shown in Foundation Report # 3114, both AquaDAF and Clari-DAF performed in excess of 10 gpm/ft2.