Ecolab Inc. (NYSE:ECL) shares are gaining on Tuesday after the company reported first-quarter results. The company reported quarterly adjusted earnings per share of $1.34, which is in line with the street view.  Quarterly sales of $3.752 billion beat the analyst consensus of $3.748 billion. Sales gained 5% year over year, led by strong growth in the Institutional & Specialty and Pest Elimination segments and modest Industrial segment growth. The company reported an organic ...