Financial terms of the deal have not been disclosed. The transaction is expected to be completed by this spring, subject to customary regulatory approvals.
Neptune Benson was founded in 1956 by Junius and Raymond Gertz to serve residential and small commercial pool markets.
The company later shifted its focus to filtration systems for institutional pools larger than 250,000 gallons.
The company made good progress over the years through the introduction of new products.
Neptune Benson currently has 110 employees responsible for operations in Coventry, Rhode Island; Beaver Dam, Wisconsin; Bridgeport, Connecticut and Montreal, Canada.
Some of the popular brands and products from Neptune Benson include Defender regenerative media filter; ETS-UV disinfection system; Vortisand and Legacy sand filters, AEGIS anti-entrapment shields, Dominion butterfly valves, Guardian strainers, Greendrive VFD systems, and Lawson Aquatics accessories.
Evoqua CEO Ron Keating said: "Neptune Benson’s filtration and disinfection products have been well regarded in the industry since 1956 and complement Evoqua’s existing businesses and markets-served extremely well.
"This addition is a natural fit for us and consistent with our growth plan to double our business by the end of 2021."
Neptune Benson CEO Ken Rodi will join Evoqua’s leadership team and report to Keating.
