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2. Aquatic timing system - Wikipedia

   en.wikipedia.org/wiki/Aquatic_timing_system

   Aquatic timing systems are designed to automate the process of timing, judging, and scoring in competitive swimming and other aquatic sports, including diving, water polo, and synchronized swimming. [1] These systems are also used in the training of athletes, and many add-on products have been developed to assist with this process. [2]

3. Swimming pool sanitation - Wikipedia

   en.wikipedia.org/wiki/Swimming_pool_sanitation

   An electrically operated water pump is the prime motivator in recirculating the water from the pool. Water is forced through a filter and then returned to the pool. Using a water pump by itself is often not sufficient to completely sanitize a pool. Commercial and public pool pumps usually run 24 hours a day for the entire operating season of ...

4. Water timer - Wikipedia

   en.wikipedia.org/wiki/Water_timer

   A water timer is an electromechanical device that, when placed on a water line, increases or decreases the water flow through the use of an electro-mechanically actuated ball valve or embedded (solenoid) valve.

5. Automated pool cleaner - Wikipedia

   en.wikipedia.org/wiki/Automated_pool_cleaner

   The delay timer is an important feature for many pools, as many switch off several circulation pumps during the night to allow suspended particles to settle on the bottom of the pool; after a couple of hours, the pool cleaner begins its cleaning cycle.

6. Rules of water polo - Wikipedia

   en.wikipedia.org/wiki/Rules_of_water_polo

   The layout of a water polo pool showing the 2m and 5m markings (red and yellow), the half-way line (marked in white), a goal at either end and the length and width of the pool. Dimensions of the water polo pool [11] are not fixed and can vary between 20×10 and 30×20 meters (FINA approved matches require a 30x20 meter pool for men, and 25x20 ...

7. Water clock - Wikipedia

   en.wikipedia.org/wiki/Water_clock

   A water clock or clepsydra (from Ancient Greek κλεψύδρα (klepsúdra) 'pipette, water clock'; from κλέπτω (kléptō) 'to steal' and ὕδωρ (hydor) 'water'; lit. ' water thief ' ) is a timepiece by which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel, and where the amount ...