I cannot believe there are laws regarding when a pool may be open. However, a community can make bye laws.
Our 4 pools are open 24 hours as there are no gates etc. and can be used at any time. The pools are less than 200 m2. So no lifegaurds either-
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The info here sounds to be as I remember it.
http://costadelsol.angloinfo.com/countries/spain/poollaw.asp
Lifeguards
All swimming facilities for collective use with a total water surface area of 200 meters squared or more should have a qualified lifeguard. For swimming facilities of between 200 and 500 meters squared there should be one lifeguard. A minimum of two lifeguards are required for pool with a total water surface area of between 500 and 1000 meters squared, or one additional life guard per pool or per fraction of 500 meters squared.
This message was last edited by johnzx on 04/07/2012.