After releasing profitable first-quarter results this morning before the start of trading, Calgon Carbon Corp. (NYSE: CCC)  CEO John Stanik said in a conference call this afternoon that he looks forward to strong second-quarter results, but “not nearly as successful as the first.”

The maker of air and water filters reversed its first-quarter fortunes from a year earlier. Calgon Carbon reported a profit of $2 million, or $0.05 a share in the first quarter ended March 31, compared with a loss of $1.4 million, or $0.04 a share a year earlier. Revenues totaled $83 million, compared with $76.6 million in the year-ago quarter. Analysts surveyed by Thomson Financial were expecting $82 million in revenues, and a $0.01 profit per share.

Stanik said the second quarter is historically the company’s strongest period, but is not sure how this year’s second quarter will fare.

“It’s way too early to call,” Stanik said on the call. “April’s revenue was light, but some projects slipped into May.”

The company has high goals for its ultraviolet (UV) business this year, Stanik said. Calgon Carbon scored a “very nice” contract in Atlanta in the second quarter, he said.