Final answer:
Under the Clean Water Act, industries are required to install best practicable technology and best available technology economically achievable (BAT) for cleaning up industrial wastes.
Step-by-step explanation:
Under the Clean Water Act, industries must take a two-step approach to the cleanup of industrial wastes, first installing best practicable technology and second installing best available technology economically achievable (BAT). BAT refers to the most effective and economically feasible pollution control technologies or measures currently available. It is the highest level of technology that the industry is capable of implementing without incurring excessive costs.