Question: How long are pools for FINA events?
About the article "Human swimming", section "Sport".

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Most swimming sport events are held in special competition swimming pools, which are either long course pools (50 meters) such as those used in the Olympic Games or short course pools (usually 25 yards in the United States or 25 meters in other countries) such as those used in the FINA World Swimming Championships.
Competition pools have starting blocks from which the competitor can dive in, and possibly also touch-sensitive pads to electronically record the swimming time of each competitor. 
 "See: #Dimensions (above) and Swimming (sport)#Competition pools" Competition pools.
The Fédération Internationale de la Natation (FINA, International Swimming Federation) sets standards for competition pools: long and at least deep.
Competition pools are generally indoors and heated to enable their use all year round, and to more easily comply with the regulations regarding temperature, lighting, and automatic officiating equipment.
An Olympic-size swimming pool (first used at the 1924 Olympics) is a pool that meets FINA's additional standards for the Olympic Games and for world championship events.
It must be in length by wide, divided into eight lanes of each plus two areas of at each side of the pool.
The water must be kept at and the lighting level at greater than 1500 lux.
Depth must be at least , and there are also regulations for color of lane rope, positioning of backstroke flags (5 meters from each wall), and so on.
Pools claimed to be "Olympic pools" do not always meet these regulations, as FINA cannot police use of the term.
Touchpads are mounted on both walls for long course meets and each end for short course.
A pool may be referred to as fast or slow, depending on its physical layout.
Some design considerations allow the reduction of swimming resistance making the pool faster: namely, proper pool depth, elimination of currents, increased lane width, energy absorbing racing lane lines and gutters, and the use of other innovative hydraulic, acoustic and illumination designs. 
Construction period: May 2010 - December 2012The capacity of the venue is 45,000 seats (12,000 during the World Championships 2015).
On the football pitch of the stadium two temporary 50 meters long pools are going to be constructed.
Main pool for swimming competition, and a temporary training pool connected with the competition pool with additional athletes relax and massage area.
The total capacity of the competition arena (including temporary stands) will reach 12,000 people.
Both temporary pools and a roof in the Main Swimming Arena will be constructed to meet FINA World Championships.
General Requirements in cooperation with FINA partner — Myrtha Pools. 
The world records in swimming are ratified by the international governing body of swimming FINA.
Records can be set in long course (50 metres) or short course (25 metres) swimming pools.
FINA recognises world records in the following events for both men and women.
Freestyle: 50 m, 100 m, 200 m, 400 m, 800 m, 1500 m Backstroke: 50 m, 100 m, 200 m Breaststroke: 50 m, 100 m, 200 m Butterfly: 50 m, 100 m, 200 m Individual medley: 100 m (short course only), 200 m, 400 m Relays: 4×50m freestyle relay (short course only), 4×100 m freestyle, 4×200 m freestyle, 4×50m medley relay (short course only), 4×100 m medley, 4×50 m mixed freestyle (short course only), 4×100 m mixed freestyle, 4×50 m mixed medley (short course only), 4×100 m mixed medley The long course (LCM) records are significantly older than the short course (SCM) records, and are generally viewed as more prestigious of two.
LCM records originate as early as the early 1900s (later in the cases of butterfly evolving out of breaststroke).
As for SCM, FINA first began the recognition process for these records in March 1991, with the establishment/setting of a standard time in each event (generally tied to the then-known "World Best Time" (WBT)), which had to be bettered in order for FINA's initially recognized "World Record" in the short course event.
The ratification process is described in FINA Rule SW12, and involves submission of paperwork certifying the accuracy of the timing system and the length of the pool, satisfaction of FINA rules regarding swimwear and a negative doping test by the swimmer(s) involved.
Records can be set at intermediate distances in an individual race and for the first leg of a relay race.
Records which have not yet been fully ratified are marked with a '#' symbol in these lists.
Most of the records below were established by swimmers wearing bodysuits or suits made of polyurethane or other non-textile materials allowed in the race pool from February 2008 until December 2009.
On the eve of the 2009 FINA World Championships in Rome, the international governing body for five Olympic aquatic sports voted to ban the use of bodysuits and all suits made of non-textile materials starting 1 January 2010.
The suits seemed to improve the performance in those with larger physiques, boosting performance in some athletes more than others, depending on morphology and physiology, and .
On July 25, 2013 FINA Technical Swimming Congress voted to allow world records in the long course mixed 400 free relay and mixed 400 medley relay, as well as in six events in short course meters: the mixed 200 medley and 200 free relays, as well as the men's and women's 200 free relays and the men's and women's 200 medley relays.
FINA will establish “standards” before something can be recognized as the first World Record in these events. 
Below is a list of current championship (or "meet") records for the two World Championships in swimming:  the swimming events of the FINA World Championships, held in a long course (50 meter) pool .
FINA World Swimming Championships (25m), at which swimming is the only discipline.
This meet is held in a short course (25 meter) pool.
Both events are organized by the international governing body for aquatics, FINA.
These are the fastest times ever swum at any edition of the meet.