Three treatment durations are described in the tables. They are dip, prolonged and indefinite. Dip treatments last from a few seconds to a few minutes, then fish are moved into fresh or clean water. Prolonged treatments, sometimes referred to as baths or flush treatments, are also short, lasting several minutes to hours. After a prolonged treatment fish can be removed to clean water, or clean water can be flushed rapidly through the holding container.
Indefinite treatments have no set length of time or time limit.
Fish can be left in indefinite treatments. Min and Max designations provide the range for effective treatment rates. Min refers to the minimum amount of chemical that should be used, and Max refers to the maximum. Using less than the minimum or more than the maximum amount could result in ineffective treatments or over-doses resulting in fish kills. Tables 8 and 9 are arranged differently from the other tables because treatment rates using copper sulfate vary with alkalinity.