A definition of a pool: A pond of water, of variable dimensions, with an intended use for bathing, swimming and practicing any swimming related sports.
Many classifications can be made according to its size and works execution. According to its use they can be classified into public pools, common pools and private pools.
Regarding their regulations, pools are subject to a specific regualtion, composed of National, Regional (or of the Autonomous Communities) and local rules.
National Regulation on this matter is contained in an Order of 31 May 1960, which regulates the regime of public pools and an order of 12 July 1961 which sets the rules for private pools.
Competences on this matter have been transferred to Autonomous Communities.
What region is located the pool you are refering to?