Chemicals for the control of environmental pollution; Chemicals for the purification of water; Chemicals for treating water; Chemicals for use in clarifying water; Chemicals for use in cleaning water; Chemicals for use in clearing water; Chemicals for use in industry; Chemicals for use in purifying water; Chemicals for use in the purification of water; Chemicals for use in the treatment of waste water; Chemicals for use in the treatment of water; Chemicals used in industry; Industrial chemicals; Industrial inorganic chemicals; Industrial organic chemicals; Purification chemicals; Sewerage water treatment chemicals; Waste treatment chemicals; Water purifying chemicals; Water-purifying chemicals; Chemical additives for use in the cleaning of water; Chemical agents for use in water purification; Chemical preparations for aiding water quality; Chemical preparations for the treatment of water; Chemical preparations for use in water purification; Chemical preparations for use in water treatment; Chemical products for the purification of water; Chemical products for the treatment of water; Chemical products for use in the treatment of water; Chemical products for waste water treatment; Chemical substances for purifying water; Water soluble polymers for industrial use; Water treatment preparations (chemical)

Chemical dosing (measuring) apparatus for introducing chemicals into water; Measuring probes for monitoring waste water plants; Scientific apparatus for testing samples of water; Scientific apparatus for use in water purification; Water quality monitoring equipment; Water quality sampling equipment; Apparatus for optical signal transmission; Apparatus for optical signalization; Electro-optical apparatus; Electro-optical control devices; Electro-optical instruments; Electro-optical sensors; Optical apparatus and instruments; Optical apparatus for measurement; Optical apparatus for measuring turbidity of liquid materials; Optical beam deflectors; Optical beam detectors; Optical detection apparatus, other than for medical use; Optical detection installations, other than for medical use; Optical devices, other than for medical use; Electrical charge apparatus