Neither. Say, "25 metre pool".
An olympic swimming pool is 2m deep, 50m long and 25m wide.
In the London 2012 Olympic Games the pool is 50 m length.
164.041995 feet
A semi-olympic pool is 25 meters long by 12.5 meters wide with a depth of between 1.2 and 1.6 meters.
The pool is standard Olympic size: 50 meters The pool is standard Olympic size: 50 meters
50 m
50 meters .
50 meters
That depend on where you put it and what you use to build it
I am assuming by professional, you mean Olympic size. An Olympic size pool is 50 meters. The most common lap pool is 25 yards.
Olympic Sized/Long Course -- 50m Shortcourse -- 25m