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2. Waterproofing - Wikipedia

   en.wikipedia.org/wiki/Waterproofing

   Waterproofing conducted on the exterior of a freeway tunnel. Waterproofing is the process of making an object, person or structure waterproof or water-resistant so that it remains relatively unaffected by water or resisting the ingress of water under specified conditions.

3. Underwater construction - Wikipedia

   en.wikipedia.org/wiki/Underwater_construction

   Inspection can also be done using remotely controlled underwater vehicles. [8] [9] [10] Underwater cutting and welding, may be necessary, though in most cases it can be avoided in new construction. Commercial diving, is used when necessary or when it is an economical alternative, when work must be done by a human operator at an underwater worksite.

4. Diving weighting system - Wikipedia

   en.wikipedia.org/wiki/Diving_weighting_system

   Diving is also sometimes practiced in swimming pools for training and exercise. Swimming pools can be contaminated by lead weights. Swimming pools can be contaminated by lead weights. Many divers using the same pool with lead weights will over time increase the lead contamination of the pool water until the water is changed.

5. Water seal - Wikipedia

   en.wikipedia.org/wiki/Water_seal

   Water seal may refer to: Liquid trap seal in plumbing traps; Underwater seal in pleural drainage apparatuses; Waterproofing This page was last edited on ...

6. Swimming pool - Wikipedia

   en.wikipedia.org/wiki/Swimming_pool

   A swimming pool, swimming bath, wading pool, paddling pool, or simply pool, is a structure designed to hold water to enable swimming or other leisure activities. Pools can be built into the ground (in-ground pools) or built above ground (as a freestanding construction or as part of a building or other larger structure), and may be found as a ...

7. Swimming pool sanitation - Wikipedia

   en.wikipedia.org/wiki/Swimming_pool_sanitation

   Swimming pool contaminants are introduced from environmental sources and swimmers. Affecting primarily outdoor swimming pools, environmental contaminants include windblown dirt and debris, incoming water from unsanitary sources, rain containing microscopic algae spores and droppings from birds possibly harboring disease-causing pathogens. [4]