Infilco Degremont (IDI) has a rich history dating back to 1894, when it was founded as the International Filter Company in Chicago, Illinois. International Filter first manufactured faucet disc filters for at-home drinking water treatment and quickly grew its commercial business to become known as Infilco During the 1930s, Infilco pioneered the Accelator® Clarifier, the first commercially produced accelerated rate clarifier. In the 1950's Infilco relocated to Tucson, Arizona and was purchased by General American Transportation, then was later sold to Westinghouse Electric. By this time, Infilco was unmatched in its reputation as a treatment expert.


In 1974, two strong forces – Infilco and Degremont – joined to form a company called IDI that was exclusively focused on municipal and industrial water/ wastewater treatment. This collaboration broadened the company's offering of products, systems, and solutions.

Today IDI is headquartered in Richmond, Virginia and holds more than 30 active U.S. patents in treatment technologies, most of which have been issued since 1990. IDI's history of water treatment innovation includes the first pulsating bed clarifier (the Pulsator®) and the first dense sludge clarification process (the Densator®). IDI also pioneered the first reciprocating rake bar screen for sewage plant intakes, the Climber Screen® ®.

IDI is a full-service treatment expert, providing design and equipment supply for all stages of water, wastewater and biosolids management. Recent innovations include the AquaDAF® high-rate dissolved air flotation system and the Aquaray® ultraviolet disinfection system.