Repair or maintenance of water purifying apparatus; Repair and maintenance of portable and fixed instruments and equipment for conditioning, softening, treating and filtering water; Maintenance of portable and fixed instruments and equipment for conditioning, softening, treating, filtering and deionizing water, as well as salt and chemical delivery services; Repair, installation and maintenance services related to water distribution devices and equipment; Consulting services for the construction of water treatment and purification plants, solid waste treatment plants and other municipal infrastructure facilities; Consulting services in the field of water filter installation; Maintenance of soda water and bubble drink preparation equipment; Filling, refilling, exchange, replacement and refurbishment of carbon dioxide cylinders used in soda water and bubble beverage preparation equipment; Rental of car-washing apparatus; Providing self-service car washing facilities; Vehicle cleaning; Anti-rust treatment for vehicles; rental of cleaning machines; construction consultancy; upholstery repair; vehicle maintenance; safe maintenance and repair; Retreading of tires; Petroleum exploitation; Charging of electric vehicles; clock and watch repair; rustproofing; elevator installation and repair; Building installation and repair; Installation, maintenance and repair of computer hardware; Interference suppression services for electrical apparatus; Maintenance and repair of medical diagnostic equipment; Vehicle breakdown repair services; photographic apparatus repair; furniture maintenance; dry cleaning; disinfecting