11
Heat accumulators; Heat pumps; Heat exchangers, other than parts of machines; Storage heaters; Heat generating apparatus
17
Waterproofing and moisture proofing articles and materials
19
Sewers (Non-metallic -); Drain pipes; Sewer pipes (Non-metallic -); Branching pipes, not of metal; Drain pipes, not of metal; Penstock pipes, not of metal; Guttering (Non-metallic -) for the collection of waste water; Guttering (Non-metallic -) for the dispersal of waste water; Water-pipes, not of metal
35
Data processing for others, for a fee
37
Installation and repair of waste water pipes; Cleaning and renovation of waste water pipes; Installation of sewer liners; Pipeline construction and maintenance; Irrigation devices installation and repair; Pipeline installation and repair; Installation and maintenance of irrigation systems; Services for the installation of sewers; Installing septic fields; Installation of plumbing; Installation of pipework systems; Installation of water supply apparatus; Swimming-pool maintenance; Cleaning of water supply plumbing; Cleaning services; Services for the repair of drains; Repair of water supply installations; Drilling of wells; Underground civil engineering services; Civil engineering relating to water irrigation; Installation of water pipes; Plant maintenance; Maintaining and repair of drain pipes; Maintenance and repair of pipeline systems; Maintaining and repair of rain channels; Repair or maintenance of water purifying apparatus; Sewer pipe maintenance; Maintaining septic systems; Servicing of conduits; Maintenance of water purifying apparatus
39
Supplying consumers with water; Storage, transport, conducting, distribution and supply of energy from hydroelectric power; Sewage disposal [transport] services; Collection of sewage through public sewers; Water distribution and supply; Water distribution and supply; Dumping [transportation] of sewage waste; Water distribution and supply; Water distribution; Water supplying
40
Waste water treatment; Treatment of water, in particular drinking water and service water; Waste water treatment; Waste water treatment; Waste water treatment; Waste water treatment; Waste water treatment; Waste water treatment; Water treating
42
Engineering services, physics [research], chemistry services, surveying, technical consultancy and expertise; Preparation of data processing programmes; Quality audits; Technical consulting in the field of environmental engineering; Engineering design and consultancy; Water analysis; Engineering project management services; Technical project studies