Marlo Inc., a water treatment equipment manufacturer in Racine, is undergoing a $3.5 million to $4 million expansion that will double its manufacturing plant to 65,000 square feet and its office space to 10,000 square feet.

Started by Waukesha-based Andrew Bukacek Construction in September, the project is expected to be completed in June or July of 2016. It marks Marlo’s third expansion since opening its current facility in 1977. The previous expansions, in the late ’80s and in 2001, each added approximately 10,000 square feet.

“We’ve been out of space for a couple years now, and we’ve just been managing it,” said president and chief operating officer Steven LaMere.

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