Neptune-Benson, a producer of commercial aquatic filtration systems, has purchased Engineered Treatment Systems for an undisclosed sum.

This is part of an overall growth strategy for Coventry, R.I.-based Neptune-Benson. Last year, it was purchased by the Audax Group, an investment firm with offices in Boston and New York. Shortly after that, Neptune-Benson acquired Lawson Aquatics, which manufactures main drains and rim-flow system components.

“As part of that go-forward plan, the intent was to grow Neptune-Benson and make our products and services more attractive to the aquatics industry,” said Barry Gertz, Neptune-Benson CEO. “This was a second step.”

Engineered Treatment Systems manufactures ultraviolet technology for aquatic, industrial and municipal applications. The acquisition adds another product category to Neptune-Benson’s offerings, and has the potential to bring the company’s products into a new market. “A good part of ETS’ business is in the industrial worlds,” Gertz said. “We’re excited about the prospect of Neptune-Benson expanding into industrial applications as well. Many of our products can cross over to that sector very easily.”

For its part, ETS stands to gain expanded research and development resources, said ETS President Jon McClean in a press release.

ETS will remain in its new Beaver Dam, Wis., facility, and continue as an independent operation. The product line, managers and staff will remain in place, Gertz said. Neptune-Benson plans to continue its growth trajectory with future acquisitions, he added.