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  2. Automated pool cleaner - Wikipedia

    en.wikipedia.org/wiki/Automated_pool_cleaner

    The suction action of the pool's pump provides the needed force for the machine to randomly traverse the floor and walls of the pool, extracting dirt and debris in its path. The first automatic pool cleaner was a suction cleaner. Suction-side cleaners are the least expensive and most widely used pool cleaners.

  3. 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 ...

  4. Solar water heating - Wikipedia

    en.wikipedia.org/wiki/Solar_water_heating

    Pool covering systems, whether solid sheets or floating disks, act as insulation and reduce heat loss. Much heat loss occurs through evaporation, and using a cover slows evaporation. STCs for nonpotable pool water use are often made of plastic. Pool water is mildly corrosive due to chlorine. Water is circulated through the panels using the ...

  5. Elevator - Wikipedia

    en.wikipedia.org/wiki/Elevator

    However, the door close button will cause a hall call to be ignored (so the door will not reopen), and once the timeout has expired, the door close will immediately close the door, for example, to cancel a door open push. The minimum timeout for automatic door closing in the US is 5 seconds, [63] which is a noticeable delay if not over-ridden.

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  7. Human factors in diving equipment design - Wikipedia

    en.wikipedia.org/wiki/Human_factors_in_diving...

    Reels may also be open or closed. This refers to the presence of a cover around the spool, which is intended to reduce the risk of line tangles on the spool, or line flipping over the side and causing a jam. To some extent this works, but if there is a jam the cover effectively prevents the diver from correcting it.