Chemicals for waste water treatment, for purifying water, for desalting water, chemicals for use in water filtration, chemicals used in reverse osmosis filtration, ion-exchange resins, synthetic resins for use in water treatment, synthetic resins for use in water purification, synthetic resins for use in desalting water; polymer and plastic sheet membranes wound in a spiral to be used for purifying water, for desalting water and in reverse osmosis filtration; polymer sheet membranes to be used for purifying water, for desalting water, polymer sheet membranes to be used in reverse osmosis filtration
