Treatment, service, work:
-sewer manholes and inlets
-waste and storm-water drainage
-consumer's installation of refuse, drain of WC, bath-tubs, basins, sinks and domestic risers
-treatment of stacks and floats (vertical, horizontal)
-septic tanks, catch pits, traps, sumps and gulleys
-grease traps, mud sumps, oil traps
-waste disposal ...