The aeration of chemical solutions is generally to provide an even distribution of salts in a plating bath, or to ensure a homogeneous mix of chemicals. 

Side channel, dry running rotary vane or rotary claw types would commonly be used to provide the required low pressure air.

Typical Products:

SKE / SKG-2 / CHILI SGP / MARIN SSP / BORA SAP / BORA SAH / BLIZZARD SFH /

BLIZZARD SFP / COVAC SMD / PICOLINO DTE / PICO DLT / DRUVAC DTA / MACRO VTB / ZEPHYR DLR