ballast water watten add NaOH

USGS scientist, Barnaby Watten, adding sodium hydroxide to ballast water test chambers aboard the M/V American Spirit

This photograph was taken aboard the M/V American Spirit, a bulk cargo ship owned by the American Steamship Company, during Spring 2015 after taking up ballast water from Indiana Harbor in Lake Michigan. Trials were conducted aboard the ship to evaluate the effectiveness of raising the pH of ballast water as a method for killing non-native species in the ballast water of freshwater cargo ships.