Chemicals for industrial and scientific use; chemicals for industrial and scientific use, namely, demulsifiers; chemicals for industrial and scientific use, namely, descaling preparations, other than household purposes designed for the removal of scale, magnetite, algae, humus, shellfish including mussels, lime, rust and other deposits in equipment used in water systems such as pipes, heat exchangers, centrifugal pumps and operating water systems for purifiers and desalination systems; chemic...