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  2. 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 ...

  3. Swimming pool sanitation - Wikipedia

    en.wikipedia.org/wiki/Swimming_pool_sanitation

    Two distinct and separate methods are employed in the sanitation of a swimming pool. The filtration system removes organic waste on a daily basis by using the sieve baskets inside the skimmer and circulation pump and the sand unit with a backwash facility for easy removal of organic waste from the water circulation.

  4. Pond liner - Wikipedia

    en.wikipedia.org/wiki/Pond_liner

    Pond liners need to be protected from sharp objects (for example, stones) below the liner and from being punctured by any objects in the water body. Protection can be provided with layers of sand, geotextiles (particularly needle-punched nonwovens) and other materials. Pond liners are manufactured in rolls or accordion-folded on pallets.

  5. Form liner - Wikipedia

    en.wikipedia.org/wiki/Form_liner

    In 1972, form liner manufacturers created a fluted form liner with graphic inlays of shrimp boats, a famous crawfish wrapped around an oil bearing, tug boats and race boats. This sound/retaining wall, located in Morgan City, LA , was to be the first use ever of graphic inlays in form liner.

  6. Underground power line - Wikipedia

    en.wikipedia.org/wiki/Underground_power_line

    Underground cables need a narrower surrounding strip of about 1–10 meters to install (up to 30 m for 400 kV cables during construction), whereas an overhead line requires a surrounding strip of about 20–200 meters wide to be kept permanently clear for safety, maintenance, and repair.

  7. Electrical bonding - Wikipedia

    en.wikipedia.org/wiki/Electrical_bonding

    Plaque at train station in Melbourne showing area where all metal objects carry the same electrical potential. Electrical bonding is the practice of intentionally electrically connecting all exposed metal items not designed to carry electricity in a room or building as protection from electric shock.

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