Model #FS-KWI Foam Seperator / Protein Skimmer
This unit is intended to simply hang inside the top of your tank and remove proteins by producing a foam discharge.
In the lower section of the pipe, a fine pore 1.5" cube air diffuser produces small bubbles.
These bubbles create foam out of protein building in the water.
The rising bubbles create an airlift within the pipe, exhausting the water out through the shown side vent hole,
and discharging foam up and out the top.