Installation, maintenance and repair services, all for installations, apparatus, instruments and equipment used in the treatment and/or purification of water; installation, maintenance and repair services, all for installations, apparatus, instruments and equipment for purifying, sterilising, disinfecting and/or deodorising; installation, maintenance and repair services, all for the treatment of articles and/or fluids with ultraviolet light or ultraviolet lamps; information, advisory and cons...